World's Fairs or International Expositions are large-scale exhibitions that highlight technology, agriculture and other innovations of national or cultural significance. The New York World's Fair took place in Flushing Meadows, Queens from April 30, 1939 to October 31, 1940. The collection consists of postcards featuring exterior and aerial views of the New York World's Fair grounds.

Alfred Victor du Pont (1900-1970) was a partner in the Wilmington, Delaware, architectural firm of Massena and Du Pont, and he was the third child of Alfred I. du Pont (1864-1935) and his first wife Bessie Gardner du Pont (1864–1949). This small collection includes both business and personal papers. The largest portion is made up of Alfred V. du Pont's correspondence with his father, Alfred I. du Pont.

Alice Belin du Pont (1872-1944) was a member of several social clubs and became very involved with philanthropic work. She was the daughter of Henry Belin Jr. (1843-1918) and Margaretta Lammot Belin (1846-1927), and wife of Pierre S. du Pont (1870-1954). The letter is from du Pont to Haynes Battan (1898-1979), a Longwood employee.

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.

Louise Evelina du Pont (1877-1958) was the daughter of Mr. and Mrs. Henry Algernon du Pont. In 1922 Henry A. du Pont purchased the original family home, Eleutherian Mills, for his daughter who, with her husband, began restoring the house and building a Renaissance garden adjoining it. This collection consists of twelve black and white photographs of Louise and Frank Crowninshield's garden at Eleutherian Mills, apparently taken by Horace Dugdale during a visit, circa 1938. Also two photographs of the abandon Hagley House which stood nearby.

Between 1802 and 1921, Eleutherian Mills was a gunpowder mill site used for the manufacture of explosives by the du Pont family business, which was founded by Éleuthère Irénée "E.I." du Pont (1771–1834). Longwood Gardens is a series of formal display gardens in Kennett Square, Pennsylvania, that was developed by Pierre S. du Pont (1870-1954), a descendent of E.I. du Pont. These are aerial views of the residence at Eleutherian Mills and Longwood Gardens taken by Dallin Aerial Surveys Company.

From 1802 to 1921, Eleutherian Mills was a gunpowder mill site used for the manufacture of explosives by the duPont family business. The name also refers to the house and gardens on the hill above the mills, which was the first duPont family home in America. This collections contains slides and color snapshot photographs of the garden at Eleutherian Mills. Also included is an 8 mm. home movie.

Guyencourt Nurseries, Inc. was a Delaware landscape nurser set up by three young horticulturists, William E. and Mary N.R. Phelps and G. Guy Nearing, in 1929. This small group of papers traces six years of depression-era activities by a small Delaware land-scape nursery.

Charles Copeland (1867-1944) was Secretary of E.I. du Pont de Nemours and Company from 1921 to 1935. He also served on the Board of Directors from 1921 to 1942. This small collection primarily consists of scenic views of the Hagley property. The collection has been organized into three series: Brandywine and Hagley areas of Copeland estate; Rolling wheels, and Pierre Gentieu prints.

The Longwood Gardens series documents the creation and expansion of Longwood Gardens. The photographs of the property are arranged chronologically. They start with a few nineteenth century views of the property when it was the property of the Peirce family who owned it through the legacy of a William Penn land grant and continue through its intensive development under the direction of du Pont who gave personal attention to building fountains, conservatories, and a popular outdoor theater. Though the du Pont’s hosted an annual garden party, there are only images of one garden party from 1915. There are two albums of Longwood Gardens, one dates from 1907 through 1913 and shows the construction of a dam, tree plantings, the formal garden, fountains, and the Peirce-du Pont house renovation. The second album is of photographs by Gould White and dates to the 1920s. The album contains some hand-colored images by M.M. Pugh, particularly of the fountains. There are several sets of postcards that date as early as 1909 through 1931, the largest set of postcards are from 1928. Most of the postcards are black and white, though some are in color. There are glass plate negatives of the gardens and grounds, including the construction of the main conservatory in 1919 and its completion in 1920, as well as images of the mansion, and a set of images of a group of people digging out a snow drift. There are glass stereoview autochromes of the conservatory, gardens, and grounds from around 1922 and 1928, as well as color glass lantern slides of the conservatory in 1924 and garden views in 1937. There are two sets of Dufaycolor glass transparencies of garden views, grounds, and the mansion dating from around 1935-1936. There are also several issues of the newsletters Longwood Chimes and Longwood Gardens Employees, which date from 1985 through 1991.

Longwood Gardens is a series of formal display gardens in Kennett Square, Pennsylvania, that was developed by Pierre S. du Pont (1870-1954) after he purchased the site from the Peirce family in 1906. In 1921 he constructed an extensive network of conservatories which contained plantings from many locales, including species from Africa and South America. This collection consists of two homemade stereographs showing different interior views of the conservatory.

Louise du Pont Crowninshield (1877-1958) was an early leader in the field of historic preservation and a collector of antiques and hooked rugs. The collection includes her papers as well as those of her husband Francis Boardman Crowninshield, her mother, and other family members.

Louise Evelina du Pont (1877-1958) was an heiress and preservationist, who was the great granddaughter of Eleuthère Irénée du Pont (1771–1834), the founder of E. I. du Pont de Nemours and Company. She was the last du Pont to live on the Eleutherian Mills estate. This collection consists of photographic and graphic materials primarily of Crowninshield's extended du Pont family and friends. The collection has been organized into four series: Family portraits, Travel photographs, Residences, and Mary Pauline Foster du Pont sketches and collection of travel souveniers.

Russell J. Seibert (1914-2004) was the former director of Longwood Gardens. This collection consists of a typewritten script of a speech, a cassette recording of the speech, and accompanying slides.

Victorine Elizabeth du Pont Foster (1849-1934), daughter of Henry du Pont (1812-1889) and Louisa Gerhard du Pont (1816-1900), grew up at Eleutherian Mills, near Wilmington, Delaware. The drawing is a detailed plan of the formal garden at Eleutherian Mills. Placement of trees, flowers, and vines, etc., are indicated on the drawing.

T. Coleman (Thomas Coleman) du Pont (1863-1930) was President of the DuPont Company from 1902 to 1915, and a U.S. Senator from Delaware from 1921 to 1928. He married Alice du Pont (1863-1937) in 1891. The "Old Mill" was constructed in 1909 to 1910 as a weekend home for T. Coleman du Pont in an area near Greenville, Delaware. These photographs document the Old Mill, retreat of T. Coleman du Pont, and the surrounding gardens planted by his wife, Alice.

Theophilus P. Chandler (1845-1928) was an architect, artist and professor. He designed churches, houses and bridges, trainstations and other structures, such as the bear pits at the Philadelphia Zoo. He married Sophie M. du Pont (1851-1931), daughter of Henry du Pont (1812-1889) and Louisa Gerhard (1816-1900), in March 1873. The collection consists of 4 wash drawings of various scenes at Eleutherian Mills, then the residence of Henry du Pont (1812-1889).

Victorine du Pont Foster (1849-1934) was the granddaughter of Eleuthère Irénée "E.I." du Pont (1771-1834) who founded the E.I. du Pont de Nemours & Company, a chemical company which began with the production of gunpowder. Her husband was Antoine Foster (1847-1928). The collection contains a typescript of Foster's memoir, "A Lost Garden" which describes the former garden at Eleutherian Mills.

Le jardin des Plantes remains one of France's premier botanical gardens. This collection contains 1 lithograph color print and 2 photographic b&w prints featuring an aerial view of le Jardin des Plantes in Paris, France.