http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
a selective checklist of pre-1900 maps in the Library of Congress
Library of Congress. Geography and Map Division.
Washington : Library of Congress : For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1975