01543oam 2200469 450 991069860510332120150924163456.0(CKB)5470000002436598(OCoLC)882401756(EXLCZ)99547000000243659820140701d1911 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierResults of spirit leveling in Illinois, 1909 and 1910 /R.B. MarshallWashington, D.C. :Department of the Interior, United States Geological Survey,1911.Washington :Government Printing Office.1 online resource (115 pages, I page of plates) illustrationsGeological Survey bulletin ;493Title from title screen (viewed June 30, 2014)."Work done in cooperation with the State of Illinois."Includes index.Spirit leveling in Illinois, 1909 and 1910AltitudesfastIllinoisAltitudesIllinoisfastAltitudes.Marshall R. B(Robert Bradford),1867-1949,1387024Geological Survey (U.S.),Illinois,COPCOPOCLCOOCLCFOCLCAGPOBOOK9910698605103321Results of spirit leveling in Illinois, 1909 and 19103436460UNINA