These approximately 4,500 photographs document natural environments, ecologies, and plant communities in the United States at the end of the 19th and the beginning of the 20th century. Produced by American botanists between 1891 and 1936, the photos describe various ecosystems and landforms across the United States. Users can search for specific plants and some animals as well as for landforms, natural events, and weather patterns.

The collection is a bit odd in that it mixes genres and types. Clicking on the region "Pennsylvania" produces eight images, ranging from pictures of dogwoods to a photo of tree rings to three pictures of the Pittsburgh flood. A timeline and an essay on "Ecology and the American Environment" provide valuable background information as well as a bibliography. These materials are useful as record of early environmental thinking as well as a document of vanished landscapes.

These documents, exhibits, photographs, and essays tell the history of 26 prominent 20th-century scientists, physicians, and experts in biomedical research and public health. The site is divided thematically into "Biomedical Research," "Health and Medicine," and "Fostering Science and Health." The collections include published and unpublished items, such as books, journals, pamphlets, diaries, letters, manuscripts, photographs, audiotapes, video clips, and other materials. Each exhibit includes introductory narratives and biographies of each scientist and a selection of noteworthy documents. The collections are particularly strong in cellular biology, genetics, and biochemistry, with attention to health and medical research policy, application of computers in medicine, science education, and the history of modern science.

These materials examine Depression-era migrant work camps in central California. The Farm Security Administration (FSA) managed the camps that were primarily inhabited by migrants from the rural areas of Oklahoma and nearby states. The collection of materials include 371 audio recordings of songs, interviews, and camp announcements and transcriptions of 113 songs. Print and image materials include 23 photographs, newspaper clippings, and 11 camp newsletters.

Additional materials address the role of the ethnographer, including a Works Progress Administration folk song questionnaire; the field notes and correspondence of Charles L. Todd and Robert Sonkin, the original collectors of the materials; and two published magazine articles by Todd. Topics range from camp court proceedings and personal narratives to square dances and baseball games. The website also includes a bibliography, a background essay, and an essay on the recording expedition. This is a valuable site for the study of Depression-era migrants, their folk traditions, and the documentary impulse of the period.

The Spanish-American War was one of the first wars captured on film. This website features 68 motion pictures of the war and the Philippine Revolution produced by the Edison Manufacturing Company and the American Mutoscope & Biograph Company between 1898 and 1901. The films include footage of troops, ships, notable figures, parades, and battle reenactments shot in the U.S., Cuba, and the Philippines. Theodore Roosevelt's Rough Riders are featured alongside footage of the USS Maine in Havana harbor. "Special Presentation" puts the motion pictures in chronological order and brief essays provide historical context. "Collection Connections" provides thought-provoking activities and essay topics. This glimpse at early film footage enhances our understanding of the fledgling technology, and offers a way to better understand U.S. imperialism at the turn of the century. The films expose some of the ways in which the birth of cinema emerged alongside, and shaped, changing ideas of gender, race, sexuality, and nation.

On March 25, 1911, a fire broke out at the Triangle Shirtwaist Factory in New York City causing the deaths of 148 garment workers—an event that came to be known as one of the hallmark tragedies of the industrial age. This website tells the story of the fire in six chapters: Introduction; Sweatshops and Strikes; Fire; Mourning and Protest; Relief Work; and Investigation, Trial, and Reform.

The text, targeted to a middle and high school audience, is accompanied by numerous primary sources that could be of use to more advanced researchers. These include close to 70 photographs, 18 newspaper articles, 17 testimonials, three oral histories, excerpts from investigative reports written in the years following the fire, several letters from witnesses, a lecture given by Secretary of Labor Frances Perkins in 1964, and a radio drama reenacting the event. Accompanying these primary sources is a list of victims and witnesses, a selected bibliography of works surrounding the fire, and tips for writing a paper.

Nearly 4,000 panoramic photographs of cityscapes, landscapes, and group portraits, deposited as copyright submissions by more than 400 companies, are displayed on this site. Panoramic photographs were used to advertise real estate and to document groups, events, and gatherings. Images depict all 50 states, the District of Columbia, and more than 20 foreign countries and territories. Subjects include cityscapes, landscapes, group portraits, agricultural life, disasters, education, engineering, fairs and expositions, industrial scenes, military activities, performing arts, sports, and transportation. Although the images cover the period from 1851 to 1991, the collection centers on the early 20th century. The site includes a bibliography, an illustrated 1,000-word background essay on the history of panoramic photography, and an essay outlining the technicality of shooting a panoramic photograph. Four essays focus on specific photographers: George R. Lawrence (1869–1938); George N. Barnard (1819–1902); Frederick W. Brehm (1871–1950); and Miles F. Weaver (1879–1932).

These Territorial Kansas collections convey the growing divisions in Kansas and the nation over the expansion of slavery, federalism, nationalism, industrialization, and changing political coalitions in Congress. Materials include government documents, diaries, letters, photographs, maps, newspapers, rare secondary sources, historical artifacts, and images of historic sites. The website is divided into five sections: Territorial Politics and Government; Border Warfare; Immigration and Early Settlement; Personalities; and National Debate about Kansas. Each is searchable by keyword, author, and county. Topical sections are subdivided into relevant themes and include an introductory essay. Visitors will find essays on territorial politics, the rights of women and African Americans, military organizations, and free state and pro-slavery organizations. "Personalities" lists 32 individuals, including John Calhoun, and the final section presents both anti-slavery and pro-slavery perspectives of the national debate about Kansas. The site also includes a timeline with links and an annotated bibliography.

Hundreds of thousands of documents spanning four centuries of American history are available in this large archive. Broadsides, ephemera, pamphlets, and booklets are available from 1639 to 1900. More than 1,300 newspaper titles, representing all 50 states, range in date from 1690 to 1922. U.S. Senate and House of Representatives reports, journals, and other documents are available from 1817 to 1980. Legislative and executive documents from the Early Republic are also included. The entire body of documents is keyword searchable, and, in addition, each collection can be searched and browsed individually. These documents shed light on many aspects of American social, political, economic, and cultural history, and can provide a valuable window into the daily lives of early Atlantic peoples. The collection of broadsides and ephemera is especially useful for exploring the history of printing in the United States, as all titles can be browsed by bookseller, printer, or publisher.

This anthropological exhibit displays, explains, and interprets the Lakota pictorial histories known as winter counts. Featuring a searchable database of winter count images, a documentary about Lakota history and culture, and video interviews with Lakota people, website visitors can view images from 10 winter counts and examine their symbols in detail by year with curator comments. Visitors are also able to examine the various symbols used by the winter count keepers to represent plants and animals, ceremonies, health, trade goods, places, people, the U.S. government, and the sky. "Who Are the Lakota" offers a historical overview of Lakota history in 10 segments that include the Lakota and the Sioux people, Lakota origins, westward migration, horse-centered culture on the northern Great Plains, important conflicts and treaties, confinement to the Great Sioux Reservation, and subsequent land cessions.