These published works, manuscripts, images, and motion picture footage address the formation of the movement to conserve and protect America's natural heritage. Materials include 62 books and pamphlets, 140 Federal statutes and Congressional resolutions, 34 additional legislative documents, and excerpts from the Congressional Globe and the Congressional Record. An additional 360 presidential proclamations, 170 prints and photographs, two historic manuscripts, and two motion pictures are available.

Materials include Alfred Bierstadt paintings, period travel literature, a photographic record of Yosemite, and Congressional acts regarding conservation and the establishment of national parks. An annotated chronology discusses events in the development of the conservation movement with links to pertinent documents and images.

This collection presents 1,395 photographs by the American photographer, music and dance critic, and novelist Carl Van Vechten (1880-1964). The site consists primarily of studio portraits of celebrities, most of whom were involved in the arts, including actors, such as Marlon Brando and Paul Robeson; artists, such as Marc Chagall and Frida Kahlo; novelists, such as Theodore Dreiser and Willa Cather; singers, such as Ethel Waters and Billie Holiday; publishers, such as Alfred A. Knopf and Bennett Cerf; cultural critics, such as H. L. Mencken and Gilbert Seldes; and figures from the Harlem Renaissance, such as Langston Hughes, Countee Cullen, and Zora Neale Hurston.

More than 80 photographs capture Massachusetts and Maine landscapes and seascapes; others include eastern locations and New Mexico. Many photographs of actors present them in character roles. Searchable by keyword and arranged into subject and occupational indexes, this collection also includes a nine-title bibliography and background essay of 800 words on Van Vechten's life and work. A valuable collection for the documentation of the mid-20th-century art scene.

Photographs from 1839 to the late 20th century are on view in 12 exhibits that offer 100- to 600-word introductory essays and a diverse range of images.

"The Face of Slavery" presents 10 photographs of African Americans from 1855 to 1905.

The work of Southworth and Hawes, a photography team active between 1843 and 1862, is represented by eight daguerreotypes of women.

In "Do You Believe?" visitors may consider evidence of ghostly existence offered by 22 "spirit photographs" taken between 1875 and 1932.

In "Photography as a Fine Arf!," 16 photos from the 1850s to the 1950s "explore the complex relationships of people and dogs."

In "At Ease," nine photographs from around 1850 refute the popular notion that early portraiture was stiff.

An exhibit of the trick photography of William H. "Dad" Martin presents eight photos produced between 1894 and 1912 that show exaggerated ordinary objects.

In "Of Bricks and Light," the museum exhibits 33 architectural photographs.

Business executive and photographer Shotaro Shimomura took pictures of his trip around the world in 1934-35; nine of these are exhibited in "An Eye for the World."

An interactive exhibit of nine cartes de visite allows visitors to investigate details such as the hats worn by men in Abraham Lincoln's funeral procession.

"Scott Mutter: A More Perfect World" presents 11 "hyper-realistic" photomontages by the acclaimed image maker.

"Masterworks of Photography" includes 25 images produced from 1840 to 1975, including English inventor William Henry Fox Talbot's "The Footman," of 1840, considered the earliest photograph on paper of a human being.

In addition, the museum showcases 42 of its favorite pieces.

The site also provides a 1,700-word explanatory essay on photographic processes and links to 25 other resources concerning the history and art of photography. This site cannot be searched by subject, however, which limits its usefulness for research.

Produced at the Mathew Brady studio, this collection contains more than 725 early photographs, most of them daguerreotypes. The Brady images include portraits of prominent public figures, such as President James K. Polk, Thomas Hart Benton, Thomas Cole, Horace Greeley, and the earliest known images of President Abraham Lincoln and his wife Mary Todd Lincoln.

In addition, the site presents daguerreotypes by African American photographers; architectural views taken around Washington, DC and Baltimore, MD; street scenes of Philadelphia, PA; early portraits by Robert Cornelius; and copies of painted portraits. A short introduction to the daguerreotype medium and a "Timeline of the Daguerrian Era" provide context for the images. A special presentation, "Mirror Images: Daguerreotypes at the Library of Congress," includes photographs from the American Colonization Society, occupational daguerreotypes, portraits, and architectural views. Useful for studying 19th-century photography and visual culture, as well as for viewing some of the earliest American photographs.