http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Aeromagnetic map and associated depth map of the Upper Mississippi Embayment region
2 maps on 1 sheet ; sheet 40 x 79 cm., folded in envelope 25 x 32 cm.
by T.G. Hildenbrand [and others] ; Department of the Interior, United States Geological Survey.
Miscellaneous field studies ; map MF-1158