http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
4 color maps ; 118 x 87 or 188 x 76 cm. folded in envelopes 28 x 23 cm.
East sheet -- East central sheet -- West central sheet -- West sheet.
William D. Hardeman, compiled and edited by Robert A. Miller [and others].
"Contour interval 100 feet, with supplementary contours at 50 foot intervals."
Each sheet includes "Map showing sources of geological information" and index map of sheets.