The collection is divided into the following nine series: Illustration; Artwork, non-published; Photo albums as Howard Pyle student; Photofile; Personal and biographical; Models; Conservation and restoration; Places; and Things - slides.

The Illustration series consists of negatives of Schoonover's published illustrations, including both serials and books. Magazines represented in this series include American Girl, Century Magazine, Harper's Magazine, Junior Red Cross Journal, Outing Magazine, Peoples Ideal Fiction Magazine, Popular Magazine, Red Book Magazine, Scribner's Magazine, American Boy, Country Gentleman, Ladies Home Journal, Progressive Farmer, and Youth's Companion. There are also images of the illustrations Schoonover completed for a 1941 DuPont Co. Safety Calendar. Book illustrations in this series are noted by title and include genres such as children's classics, history, westerns, and adventure.

The Artwork, non-published, series consists of negatives of Schoonover's easel paintings, murals, sculpture, and stained glass. Easel painting images make up the bulk of this series and include landscapes, portraits, and subject paintings. Where possible, the paintings are identified with the corresponding number Schoonover assigned in his daybooks.

The series, Photo albums as Howard Pyle student, is a small series and consists of negatives corresponding to images in photograph albums taken during Schoonover's time as a Howard Pyle student and date from 1898 to 1902.

The Photofile series, as maintained by Schoonover, consists of negatives primarily taken on research trips for Schoonover's artwork and illustrations. These images are identified by place or by subject. The series includes images of Bushkill, Pennsylvania, and various natural scenery from other Pennsylvania locations, some taken on camping trips. Delaware locations are also represented such as Old Drawyer Church in Middletown, Old College in Newark, Rehoboth, Schoonover's Franklin St. studio, the Delaware River, and houses in Milford. Also included are negatives taken during research for muckraking articles for which Schoonover contributed illustration. Such images include anthracite coal mills near Scranton, Pennsylvania in 1903 taken for the article, "Children of the Coal Shadows," by Francis H. Nichols; a 1903 trip to New York City for the article, "The Waifs of the Street," by Ernest C. Poole; a 1906 trip to the western United States for an article on the Juvenile Court system written by Lincoln Steffens; and Italian immigrants traveling in steerage on the ship, Konigin Luise, in 1908 or 1909. There are also images taken on Frank and Martha Schoonover's honeymoon in Louisiana and Cuba and Irénée du Pont's residence, Xanadu, in Cuba taken circa 1931. Images identified by subject include schooners, yachts, river boats, ships, shad fishing, various trees, horses, autumn scenes, corn shucks, swamps and marshes, splatter docks, buildings and houses, cattle, costumes, flower gardens, ice on ponds, Indianapolis/Mississippi steamers, horse-drawn vehicles, and fishing at Maskenozha and Mast Hope. Others include "Gypsies;" logging camps; American Indians; a train wreck; lineman on pole; Ephrata Cloisters; Jamaica; and Barataria, Louisiana.

The Personal and biographical series depict Schoonover, his family, friends, and students. His two children, Cortlandt and Elizabeth feature prominently. There are many images taken at Schoonover's Bushkill, Pennsylvania property and his Wilmington studio. There are also images of his mentor, Howard Pyle, as well as other Pyle students and images of exhibitions of Schoonover's work.

The Models series consists of images Schoonover photographed of male, female, child, and animal models he used as the basis for many of his illustrations. Many of these are identified by the title of the illustration for which the subject was posing. A few of the individuals are identified by name and include Marie Stewart, Betty L. Hall, Rev. Don Large, Rev. D. Parsons, John Porter, Charles Staats, and Sgt. James P. Conner. Others are identified by subject, which include firefighters, hunters, American Indians, Mounties, and pirates. Animals represented include, among others, cows, dogs, circus elephants, horses. Finally, there are a few images of inanimate objects including furniture, ships, guns and boots.

The Conservation/Restoration series consists of photographs of artwork by artists other than Schoonover that Schoonover repaired or restored as part of his studio business.

The Places series comprises photographs not included in the Photofile of locations around the United States and various international locations. The bulk of the series consists of images taken during Schoonover's 1903 and 1911 trips to Canada. Schoonover's Bushkill, Pennsylvania, property also features prominently. There are also images of Bermuda; Cuba; New Orleans, Louisiana; various locations in Delaware; Europe; the Henry Davis Farm; Jamaica; Rockport, Massachusetts; various locations in Montana; Trenton, New Jersey; Bushkill, Pennsylvania; and the Northwest United States.

The Subject - slides series consists of negatives largely undated identified by subject of various activities, objects, buildings, and people. Subjects include airplanes, artwork not by Schoonover, a bank vault, the beach and ocean, boating and canoeing, unidentified buildings, camping, cars, a cemetery, circus, unidentified city scenes, an eel weir, ducks, barns, farming, fishing, gardens, gas stations, hay wagons, horse-drawn wagons, Indians, interiors, landscape scenes, pageants, painting techniques, parades, plants and trees, ponds and streams, ships and boats, swimming, tradesmen, trains and train stations, wagons, puppets, statues, a tank, and a zoo.