http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Great Lakes region gravity and magnetic map sequence
Great Lakes region total magnetic intensity map
Total magnetic intensity map, Great Lakes region
Free air gravity map, Great Lakes region
3 maps : some color ; 72 x 65 cm. folded in envelope 23 x 31 cm. + 1 text (12 pages : maps ; 28 cm.)
Sheet 1. Great Lakes region Boueuer gravity map--Sheet 2. Great Lakes region total magnetic intensity map--Sheet 3. Great Lakes region free air gravity map.
Map and chart series (Geological Society of America) ; MC-41