http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Geochemical maps showing distribution and abundance of silver in two fractions of stream-sediment concentrates, Silver City 1?x 2 quadrangle, New Mexico and Arizona
2 maps on 1 sheet ; 45 x 75 cm., on sheet 102 x 117 cm., folded in envelope 30 x 24 cm.
map A. Silver in the nonmagnetic fraction -- map B. Silver in the magnetic fraction.
Department of the Interior, U.S. Geological Survey ; by Kenneth C. Watts [and others].
Relief shown by contours and spot heights.
Includes text, index map, histogram, and bibliography.
Miscellaneous field studies ; map MF-1183-F