http://pec.lib.wvu.edu/record/P6731916Spirit leveling in West Virginia, 1896 to 1915, inclusive. Government document. Issued as: Geological Survey (U.S.). Bulletin, 632. "Work done in cooperation with the West Virginia State Geological Survey during 1898 to 1915, inclusive, I.C. White, State Geologist."Marshall, Robert Bradford, 1867-1949.West Virginia--Altitudes.14256