Horatio Allen (1802-1889) was a noted civil engineer and inventor, who worked with the Delaware & Hudson Canal Company, the South Carolina Canal and Railroad Company, the Croton Aqueduct, and the New York & Erie Railroad. The bulk of his the papers is personal correspondence (1818-1864), and biographical materials collected by his family. Also included is a small collection of Allen's business papers, particularly concerning his work on the New York & Erie Railroad.

Andrew Gray Wilson (1844-1905) was well-known among shipbuilders as a preeminent marine engineer and naval architect. This small collection consists of genealogical papers related to the Wilson family, as well as the Driver family and the Merritt family of New York.

Joseph Bancroft & Sons Company began operation in 1831 as a cotton cloth manufacturer in Rockford, Delaware. After the Civil War, the company concentrated on finishing cotton cloth. The collection contains material related to the Joseph Bancroft & Sons Company, Eddystone Manufacturing Company, genealogical notes on the Bancroft-Wood family, and the Delaware postal system.

Charles Lee Reese, Sr. (1862-1940) was a chemist and scientist at the E. I. du Pont de Nemours & Company from 1902 to 1931. The Charles L. Reese papers are a group of material from his student days, the texts of lectures and articles, biographical materials and genealogical notes.

Consists of the family papers of former DuPont CEO Lammot du Pont Copeland (1905-1983) and his wife Pamela Cunningham Copeland (1906-2001). The Copelands' papers document the lives and interests of a wealthy American couple in the twentieth century. In particular, the papers of Pamela C. Copeland are an important source of information about the public activities of women in the areas of historic preservation, gardening and horticulture, and philanthropy.

Members of the Curtis family were paper manufacturers at Newton Lower Falls, Massachusetts, and Newark, Delaware. Alfred A. Curtis (1848-1945) was president of the family paper company from 1911 to 1926. The papers consist of personal and family items collected by Alfred A. Curtis. Included in the collection is a scrapbook of photographs and newspaper clippings, a number of loose papers and clippings, and several histories of the Curtis Paper Company. The papers also contain some letters and notes of Alfred A. Curtis, many connected with genealogy and family history.

Alexis I. du Pont (1816-1857) was proprieter of his family business, E.I. du Pont de Nemours & Company, which began in the manufacture of gunpowder in 1802. He was the youngest child of Eleuthère Irénée du Pont (1771-1834), the founder of the DuPont Company. This collection contains thirteen photographic items, mostly portraits of Alexis I. du Pont and other du Pont family members.

Eleuthère Irénée du Pont (1921-1994) was a descendant of Pierre Samuel du Pont de Nemours (1739-1817) who founded the E.I. du Pont de Nemours & Company with his son Eleuthère Irénée du Pont (1771-1834) in 1802. E.I. du Pont de Nemours & Company is a chemical company more commonly referred to as the DuPont company. This collection consists of graphic materials including a photographic print of Eleuthère Irénée du Pont (1921-1994), booklets, a copy of a photographic print of Johan Andreas Philip Ludwig (1753-1803), the Ludwig family crest and a genealogy of the Pelleport family.

Francis Bannerman Son was a major purveyor of military goods to sportsmen and collectors in New York City over three generations. The collection consists of photographs of Francis Bannerman and his family, including his wife, Helen "Nellie" Boyce Bannerman (1852-1931), and his sons, Francis VII (1873-1946) and David (1875-1957). The collection also includes photographs of Bannerman's Island Arsenal, including images of the 1969 fire in full blaze and its destructive aftermath.

Henry du Pont (1812-1889) was the second son of Eleuthère Irénée du Pont (1771-1834) and senior partner of E.I du Pont de Nemours & Company from 1850 to 1889. The collection consists of materials relating to the descendants of Henry and Louisa Gerhard du Pont. Primarily, the collection consists of portraits and other photographs of their daughters Evelina, Ellen, Louisa, Sara, Victorine, Sophie and other family members.

Stewart Huston (1898-1971) began his career as a metallurgist and worked in varying capacities in the family business, Lukens Steel Company, in Coatesville, Pennsylvania, from 1923 until his death. Assembled by Huston, the collection relates to genealogy and family history.

Jean Kane Foulke du Pont (1891-1985) was a suffragette, prison reform activist, philanthropist, and wife of E. Paul du Pont (1887-1950). The collection contains three photocopied volumes of her ancestry of many of the earliest families of New Netherland and colonial Pennsylvania. The volumes include an introduction, genealogy tables, reproductions of paintings and photographs, and family lore collected by the author over the preceding sixty-eight years. There is an index at the end of volume three.

Karen du Pont Farquhar (1947-) is the great-granddaughter of T. Coleman du Pont (1863-1930), president of E.I. du Pont de Nemours & Company in the early 20th century. This collection of photographs is part of a larger group of du Pont family papers, which are housed in the Manuscripts and Archives Department. The photograph collection includes many photographs of the du Pont family from 1882 to 1960.

The Lainé family was related to Peter Bauduy (1769-1833) a French refugee from Santo Domingo who was a business partner of Eleuthère Irénée "E.I." du Pont (1771-1834) of the DuPont Company. The family papers contain items from several generations and include a diary from Pierre-Francois Lainé's (1775-1846) captivity in Russia, Francois Damas Laine'ś (1823-1901) diary from his visit to France, Marie Lainé Santa Maria's (1866-1961) memoirs as a child living on a sugar plantation in Cuba, translation, and typescripts of the diaries, and genealogical information.

Thomas Lea (1757–1823) joined in partnership with Joseph Tatnall (1740–1813), and passed on the Tatnall-Lea grain mills in Wilmington, Delaware to his son William Lea (1805-1876), who took over operation of the mills in 1837. In 1864, William Lea brought his sons Henry Lea (1839-1888) and Preston Lea (1841-1916) into the firm, changing the name to William Lea & Sons Company. This collection includes portraits of members of the Lea and related families. These include such family names as Tatnall, Warner, Preston, Ferris, Downing, Spruance, Lovett, Moore, Bush, Ely, and others.

Marguerite du Pont Lee (1862-1936) was a descendant of Pierre Samuel du Pont de Nemours (1739-1817) who founded the E.I. du Pont de Nemours & Company with his son Eleuthere Irenee du Pont (1771-1834) in 1802. The E.I. du Pont de Nemours & Company is a chemical company more commonly referred to as the DuPont Company. This small collection consists of four items belonging to Marguerite du Pont Lee. Two individual portraits, a photograph of a gate, and a decorative leaf.

Margaretta “Meta” du Pont Coleman (1862-1938) was a descendant of Pierre Samuel du Pont de Nemours (1739-1817) who founded the E.I. du Pont de Nemours & Company with his son Eleuthère Irénée du Pont (1771-1834) in 1802. The E.I. du Pont de Nemours & Company is a chemical company more commonly referred to as the DuPont company. She collected family portraits while compiling a family genealogy. This collection includes daguerrotypes, tintypes, ambrotypes and other early portrait photographs of various family members.

The Lea family were among the largest flour mill operators at the Brandywine Falls, north of Wilmington, Delaware, since the 1770s, when Thomas Lea (1757–1823) joined in partnership with Joseph Tatnall (1740–1813). The album contains considerable genealogical information on the Lea family, as well as thirty-eight silhouette portraits of members of the Lea and related families. These include family names such as Tatnall, Baily, Bellah, Warner, Pusey, and Rodman.

The Wilson and du Pont families were prominent families in the Wilmington, Delaware area. The papers document the daily activities of three generations of Natalies: Natalie Green Driver (Wilson)(1846-1912), Natalie Driver Wilson (du Pont)(1877-1918), and Natalie Wilson du Pont (Edmonds)(1904-1975).

The five generation of the Peirce family owned farmland in Kennet Square, Pennsylvania. Over time the family added recreational facilities and opened the land to the public as "Peirce's Park" now Longwood Gardens. This small collection consists of photocopies of correspondence related the genealogy of the Peirce family.

Pierre Gentieu (1842-1930) was an artist, photographer, and an employee of the DuPont Company for thirty-four years. Pierre Gentieu and his wife, Sarah Albina "Binie" Gentieu (1846-1925) had six children. Although three children had no issue, they had nine grandchildren and twenty great grandchildren. All six children worked for the DuPont Co. and several grandchildren did as well. This collection consists of nine albums that document the Gentieu family history, primarily the life of the patriarch of the family Pierre Gentieu (1842-1930). The albums contain originals and reproductions of correspondence, family trees, documents, photographs, and ephemera.

Pierre Samuel du Pont de Nemours (1739-1817) was a French political economist, writer, publisher, and public administrator. In 1800, accompanied by his sons, Victor Marie du Pont (1767-1827) and Eleuthère Irénée du Pont (1771-1834), he arrived in America. The collection contains photocopies and microfilm of selected documents concerning du Pont de Nemours and members of his family from Mairie de Montargis and Mairie de Chevannes.

Sarah Dennen (1882-1970) was a descendant of G.W. Peirce, the original owner of Peirce's Park (now Longwood Gardens). The collection includes biographical notes and brief reminiscence of Peirce's Park in the late nineteenth century.

The Crofton and Shubrick families were descendants of a prominent French American diplomat and businessman, Victor Marie du Pont (1767-1827), and represent middle-class American families in the mid-to-late nineteenth century. The collection includes a small amount of material from the Shubrick and Crofton family from the nineteenth century to mid-twentieth century.

The Spruance family was a well-known family in Delaware. The family includes Senator Presley Spruance (1785-1863), Judge William C. Spruance (1831-1913), William Spruance (1873-1935), among many others. The collection includes material related to the genealogy of the Spruance family of Delaware, particularly correspondence from and to members of the Spruance family regarding their genealogy and the book compiled by William Spruance, The Spruance family in Delaware, 1733-1933.

Henry Disston & Sons, Inc. was a major manufacturer of saws and other woodworking tools and one of the largest industrial firms in Philadelphia. Henry Disston (1819-1878) founded the company in 1855. The firm remained in family control until 1955. This collection consists of a two-volume typescript "The Disston History," a genealogy of the Disston family, and a company history of Henry Disston and Sons, Inc., compiled by family members and genealogist Elizabeth B. Satterthwaite (1856-1948) in 1920. The copy images in the collection include portraits of Disston family members, board members, and employees and interior and exterior images of the Disston Saw Works in Tacony, a suburb of Philadelphia.

William Young (1755-1829) was a Philadelphia bookseller and later a manufacturer at Rockland, Delaware. Miscellaneous papers including genealogical and biographical information, letter, and paper samples produced by Young.

The Wurts family were involved in the anthracite coal industry. In 1823 four brothers: Maurice Wurts (1783-1854), William Wurts (1788-1858), Charles Stewart Wurts (1790–1859), and John Wurts (1792-1861) founded the Delaware and Hudson Canal Company originally to mine anthracite coal and transport the resource to New York. The company built the Delaware and Hudson Canal and later became the Delaware and Hudson Railway. The Wurts family papers were collected by John Sparhawk Wurts (1876-1958) and reflect both family papers and business records.