Grand Union Tunnel

KOSCHMANN, A.H. AND WELL, F.G., 1946, PRELIMINARY REPORT ON THE KOKOMO MINING DISTRICT, COLORADO: COLORADO SCIENTIFIC SOCIETY PROCEEDINGS, VOL. 15, NO. 2, P. 51-112.U.S. GEOLOGICAL SURVEY, 1942, TENMILE MINING DISTRICT, COLORADO: U.S. GEOLOGICAL SURVEY (UNCLASSIFIED MAP), SCALE: 1:12,000.CONSV. DIV. COMP. DATE, 8,65EMMONS, S.F., 1898, GEOLOGIC ATLAS OF THE UNITED STATES - TNEMILE DISTRICT SPECIAL FOLIO, COLORADO: U.S. GEOLOGICAL SURVEY FOLIO 48.WILSON, ANNA B., AND LAROCK, EDWARD J., 1991, ASCII DATABASE FOR PRINCIPAL LODE MINES AND MINERALIZED AREAS IN SOUTHERN SUMMIT COUNTY, COLORADO, U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 91-0027A AND B, 22 P. AND ONE DISKETTE.WILSON, ANNA B., AND LAROCK, EDWARD J., IN PRESS, MINERALIZED AREAS AND PRINCIPAL LODE MINES IN SOUTHERN SUMMIT COUNTY, COLORADO, U.S. GEOLOGICAL SURVEY MISCELLANEOUS FIELD STUDIES MAP MF-2163, SCALE 1:50,000.