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.

Thomas Jefferson outlined three motivating factors in his instructions to Lewis and Clark: a search for navigable rivers to span the continent; a quest for Edenic beauty and riches; and the competitive desire to acquire a continental empire. These 180 documents and artifacts interpret 19th-century westward exploration from this perspective. The range of materials is striking. In addition to maps, plans, and charts, the site offers images (sketches, watercolors, etchings, and engravings), texts (letters, diaries, speeches, newspapers, and books), and tools (surveying and medical instruments, cooking utensils, armaments). The exhibit opens with an examination of the "imperial mentality" common to Virginia's aristocratic class in the late 18th century and then focuses on the Lewis and Clark journey. It ends with the subsequent expeditions of Zebulon Pike, Stephen H. Long, Charles Wilkes, John Charles Fremont, and the mid-19th century transcontinental railroad plan that supplanted the search for a water route.

The Detroit Publishing Company mass produced photographic images—especially color postcards, prints, and albums—for the American market from the late 1890s to 1924. This collection offers more than 25,000 glass negatives and transparencies and about 300 color photolithographs from this company. It also includes images taken prior to the company's formation by landscape photographer William Henry Jackson, who became the company's president in 1898. Jackson's work documenting western sites influenced the conservation movement. Although many images were taken in eastern locations, other areas of the U.S., the Americas, and Europe are represented. The collection specializes in views of buildings, streets, colleges, universities, natural landmarks, and resorts, as well as copies of paintings. Nearly 300 photographs were taken in Cuba during the Spanish-American War. About 900 Mammoth Plate Photographs include views of Hopi peoples and their crafts and landscapes along several railroad lines in the 1880s and 1890s.

This archive contains primary and secondary sources relating to reclamation efforts of the Everglades and the history of south Florida from 1884 to 1934. Comprising nearly 10,000 pages and images, the compilation includes personal correspondence; government publications, reports, and memos; and images, such as photographs, maps, and postcards. Materials document issues relating to the creation of national parks, including conflicting interests—public, private individual, and corporate—and government accountability.

The website also presents a photo exhibit, "The Everglades: Exploitation and Conservation," accompanied by a 1,000-word essay. Two additional features, an interactive timeline and 31 biographies of South Florida's most notable personalities, complete this project. This site will be of interest for those exploring the establishment of the Everglades National Park, the conservation movement, and the treatment of Native Americans, particularly the Seminoles.