A collection of more than 1,100 topographical maps created by the United States Geological Survey from the 1890s to the 1950s covering all of New England—Maine, New Hampshire, Vermont, Rhode Island, Massachusetts, and Connecticut—and selected areas of New York. The maps—which reveal roads, buildings, rail lines, bodies of water, and elevations—occur in 15-minute and 7.5-minute quadrangle series (a minute is one-sixtieth of a degree of latitude or longitude). In addition, the collection includes six maps with 30-minute quadrangles.

For states other than New York, users can view a state image map and select a point within a grid marked off in 15-minute increments to find listings for available images accompanied by dates the maps were surveyed, created, and revised. Towns within each quadrangle are also listed along with names of adjacent areas. Users also may search an alphabetical list of towns within each state. For New York, only an index of quadrangles names is available. Maps are presented in JPEG format. According to the site, "Each image is typically 2 megabytes, so download times are likely to be slow." A useful site for those studying changes in the New England landscape during the first half of the 20th century.

This division of the Perry-Castaneda Map Collection provides access to 500 historical maps of the U.S. Maps are sorted thematically and include three maps of early inhabitants, 11 of exploration and early settlement from 1675 to 1854, and 15 of territorial growth from 1775 to 1970. Of the 95 military history maps covering engagements from 1763 to 1967, 50 are about World War II alone.

Among 183 late 19th- and 20th-century maps, there are 146 of U.S. cities produced around 1920. Historic sites, memorials, and battlefields are represented in 191 maps of sites such as Aztec ruins in New Mexico, the Bering land bridge in Alaska, and the Vicksburg battle site in Mississippi. Most of the maps are excerpted from 20th-century historical atlases. The site will be particularly useful for research in military history and early 20th-century urban history.

By the time Thomas Jefferson became the third President of the United States in 1801, interest in exploring the West had begun to shape U.S. policy. This chronological narrative traces Jefferson's life, participation in politics, and accumulation of scientific geographical knowledge from 1735 to 1804. There are four main sections: "The Jeffersons and Their Frontier Virginia Neighborhood," "From Colony to Commonwealth," "Science and Statecraft at Home and Abroad," and "Public Servant to the Early Republic."

This narrative is accompanied by an archive of 169 letters, statues, books, treaties, maps, and journals providing primary source insight into Jefferson's thoughts about the West and the Lewis and Clark expedition in particular. Three interactive maps from the 1700s, overlaid with historical data about cities, private dwellings, natural features, courthouses, and waterways, provide important insight into the geographic and social environment at the time.

This large collection of maps from the 16th century to the present day focuses on Americana and cartographic treasures.

Materials are organized into seven thematic categories—Cities and Towns, Conservation and Environment, Discovery and Exploration, Cultural Landscapes, Military Battles and Campaigns, Transportation and Communication, and General Maps. Sections include five special presentations.

Users may download maps or zoom in to view details. Seventeen specific map collections contained within this larger site that are of particular importance for the study of American history include "Discovery and Exploration," "The American Revolution and Its Era," "Railroad Maps, 1828–1900," "American Colonization Society Collection: Maps of Liberia, 1830–1870," "Panoramic Maps, 1847–1929," "Civil War Maps," and "Mapping the National Parks."