http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
maps : color ; on sheets 57 x 87 cm. or smaller.
prepared and published by the Aerospace Center, Defense Mapping Agency.
Publisher and place of publication vary. Some older sheets published by Army Map Service. Some later sheets published by NIMA
Relief shown by contours, shading, gradient tints and spot heights.