TY - MAP ED - Geological Survey (U.S.) TI - Gold Hill mining area, Colo PY - 1958/// CY - Washington PB - The Survey KW - Mines and mineral resources KW - Colorado KW - Boulder County KW - Maps KW - Boulder County, Colo KW - Maps, Topographic KW - Gold Hill (Colo.) N1 - Unedited advance sheet, subject to correction; Polyconic projection; Relief shown by contours and spot heights; Datum is mean sea level, 1927 North American datum; "Topography by S. G. Lunde, surveyed in 1937 and 1938."; At head of title: Colorado (Boulder County); Scale 1:12,000; 1 in. equals 1000 feet ER -