http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Spirit leveling in Illinois, 1914 to 1917, inclusive
1 online resource (108 pages, I page of plate) : illustration.
Title from title screen (viewed July 3, 2014).
"Work done in cooperation with the State Geological Survey of Illinois."
Marshall, R. B. (Robert Bradford), 1867-1949.
Bulletin (Geological Survey (U.S.)) ; no. 672