http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Preliminary geologic map of the Clear Lake SE quadrangle, Skagit County, Washington
1 online resource (2 maps) + 1 text (11 pages).
by David P. Dethier, John T. Whetten, Paul R. Carroll.
[Reston, Va.] : U.S. Geological Survey, 1980
Open-file report (Geological Survey (U.S.)) ; 80-303