http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Isostatic residual gravity, topographic, and first-vertical-derivative gravity maps of the conterminous United States
4 maps on 2 sheets : color ; 51 x 79 cm. and smaller, sheets 107 x 123 cm. and 99 x 122 cm., folded in envelope 30 x 24 cm.
map A. Isostatic residual gravity -- map B. Topography -- map C. Isostatic residual gravity -- map D. First vertical derivative of isostatic residual gravity.
Department of the Interior, U.S. Geological Survey ; by R.W. Simpson [and others].
Includes text, bibliographical references, tables, figures, and index map.
Geophysical investigations (Geological Survey (U.S.)) ; GP-975