TY - BOOK ID - 138700509 TI - Utilization of mull (forest humus layer) in geochemical exploration in the Empire district, Clear Creek County, Colorado AU - Curtin, Gary C. AU - Lakin, Hubert W. AU - Hubert, A.E. AU - Mosier, Elwin L. AU - Watts, K. C. PY - 1968 PB - Washington United States Geological Survey, Department of the Interior DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:138700509 AB - ER -