http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Isopach maps of the Powder River Basin, Wyoming and Montana
15 maps on 3 sheets ; 44 x 44 cm., sheets 99 x 112 cm. and 105 x 143 cm. and 105 x 144 cm., folded in envelope 30 x 24 cm.
Includes text, bibliography, borehole logs, 1 figure, and location map (sheet 1).