http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Median-porosity contour maps of the J Sandstone, Dakota Group, in the Denver Basin, Colorado, Nebraska, and Wyoming
2 maps on 1 sheet ; 58 x 46 cm. and 29 x 23 cm., sheet 102 x 97 cm., folded in envelope 30 x 24 cm.
Median-porosity contour map -- Median-porosity trend contour map.
Department of the Interior, U.S. Geological Survey ; by Debra K. Higley and Donald L. Gautier.
Includes text, bibliography, 1 cross section, and 3 figures.
Miscellaneous field studies ; map MF-1982