http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
magnetic field in the United States, 1990
U.S. Department of the Interior, U.S. Geological Survey ; by Norman W. Peddie.
Alaska and Hawaii on verso. Scale 1:3,500,000.
Geophysical investigations (Geological Survey (U.S.)) ; GP-1002-D