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| U.S. Government Information, Maps & GIS Services > Guides to Government Information > Brief Guide to the Map Collection | ||
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Last revised: August, 2008 | ||
Brief Guide to the Map CollectionScope:This Guide will give a brief description of items in the Map Collection in McKeldin Library. Call the U.S. Government Information, Maps & GIS Services Staff at 301-405-9165 for more information. Table of Contents
BackgroundAs a Regional Federal Depository Library, the U.S. Government Information, Maps & GIS Services unit of McKeldin Library collects and maintains maps and charts produced and made available by the Federal Depository Library Program. The Map Collection is home to approximately 350,000 items, primarily from U.S. Government sources. Coverage includes all U.S. states, most U.S. territories and possessions, and some areas outside the U.S. A brief description of items in the Map Collection follows. Bureau of Land Management Maps (BLM)Produced by the Land Management Bureau (formerly Bureau of Land Management), these are cadastral survey maps of U.S. public (primarily western United States) lands. The scale is 1:100,000. Our collection begins around 1980.This set is made up of two series:
CIA MapsProduced by the Executive Office of the President, these are planimetric maps of countries and regions, although some thematic maps are included in this series. The maps show very little detail, and scales vary. Larger CIA Maps are in the Map Collection. The coverage is worldwide, but some maps have not been updated in the last fifteen years, in particular maps of countries primarily in southern Africa and South America. Maps produced in 1992 or later are accessible in the Catalog. DMA Topographic MapsProduced by the Defense Mapping Agency, these are topographic maps of the United States with a scale of 1:250,000. They contain the same information as USGS Topographic maps. This series of maps is not current; most of these maps are 45 years old. USFS Topographic MapsThe United States Forest Service topographic maps are USGS maps adapted by the U.S. Department of Agriculture, Forest Service. These maps are 7.5 minute topographic maps which cover the U.S. National Forests. They contain roughly the same information as the USGS topographic maps. Maps produced after 1992 are listed in the Catalog. In order to find them, do a keyword search using the name of the "forest." Note: THE USFS Topographic Maps are now interfiled with the USGS Topographic maps. USGS Thematic MapsThese maps are produced by the Department of the Interior and are primarily geologic in nature. They are indexed in the Guide to USGS Publications (U.S. Government Information Reference Z 6028.G831). The Map Collection has the following series:
USGS Topographic MapsThese maps are produced by the Department of the Interior, United States Geological Survey (USGS). USGS topographic maps include physical features such as elevations, mountains, lakes, rivers, buildings, and transportation routes. The Map Collection has three series of these maps:
Aeronautical ChartsThese charts are produced by the Defense Mapping Agency Aeronautic Center (DMAAC). We have the latest editions of these charts, which are available in four series:
Airport Obstruction ChartsShow details of areas surrounding airports. They are produced by the National Ocean Service (NOS which is part of NOAA. The scale is 1:12,000. A quarterly list outlines the dates of the latest editions available. All airport obstruction charts have the call number stem of C55.411/3:OC followed by a one- to four-digit number. Use the Catalog to find the airport number following the stem by doing a word search using the official name of the airport along with the words "obstruction chart." Nautical ChartsNautical charts are produced by two agencies: the Defense Mapping Agency, Hydrographic-Topographic Center (DMAHTC) and the National Ocean Service (NOS). The DMA nautical charts show details of navigable water bodies throughout the world. The scales vary. NOS charts cover nautical chart Region I, which is primarily the U.S., along with Puerto Rico and the Virgin Islands. Scales vary. Both sets of nautical charts are indexed in the Catalog of Maps and Charts and Related Products (Part II) (US Government Information Atlas GA359 .U54 1992). They are identified by a five-digit numerical ID. Both sets of charts have the same identification scheme; ID codes of less than five digits indicate large bodies of water. There is some Catalog coverage for these charts. |
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