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The Single MapВ Collection includes a wide range of geographic and cartographic products. Although rich resources may exist for some locations, other areas-particularly less affluent rural communities-may not be as well represented in the collections simply because fewer maps were made of these places or fewer maps were collected and preserved. It is important to remember that the quality and quantity of cartographic information that is available vary considerably over place and time. Research projects that focus on a particular geographic or political unit such as a state, county, or city are most easily supported by cartographic material. In addition, there may be several possible filing locations for identical copies of the same item or very similar items, and a variety of additional filing locations for closely related items.

The holdings are frequently further subdivided by subject. For example, historians will find cartographic sources filed under вЂњNorth America,вЂќ вЂњUnited States,вЂќ and the names of regions, individual states, and administrative units such as counties and cities. Many of the maps received in the Geography and Map Division before the advent of machine-readable cataloging in 1968 are not cataloged, maps which are also known as being part of the Title Collection.

Many items of great interest to historians are among the approximately 1.5 million maps in the Single Map Collection, which includes both cataloged and uncatalogued material. Portions of all the following categories of maps can be found among the cataloged maps. Searches for cartographic materials can be limited by location in the Library to 'Geography & Map' and by type of material to either 'Map' or 'Map (manuscript),' as well as by language and place of publication.

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The full cataloging record for a particular map may also include contents notes that describe some of the information shown on the item. Online cataloging records may lead you to other cartographic material for a given place and time period. Though representing only a small portion of the total cartographic resources of the Library, maps searchable online represent a good cross-section of the Geography and Map Division's complete holdings, particularly Americana. This is a good place to begin a research project as you can do your initial searching in the Library's online catalog before visiting the Geography and Map Division. CatalogВ records for current acquisitions continue to be added to the automated system. Most maps acquired since 1968 have been made available in the catalog which are searchable by geographic area, title, author, and subject, as well as by call number in the Library of Congress Online Catalog.

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