1. USGS geochemical studies outline mineral potential and environmental hazards in southeastern Oregon Publication/Creation: [Denver, CO] : U.S. Geological Survey, [1997] Resource Type: Book Access & Availability: Loading
2. Utilization of humus-rich forest soil (mull) in geochemical exploration for gold Author/Creator: Curtin, Gary C., 1935- author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1968 Resource Type: Book Access & Availability: Loading
3. Utilization of humus-rich forest soil (mull) in geochemical exploration for gold Author/Creator: Geological Survey (U.S.) Publication/Creation: Washington : [U.S. Govt. Print. Off.], 1968 Resource Type: Book Access & Availability: Loading
4. Utilization of mull (forest humus layer) in geochemical exploration in the Empire district, Clear Creek County, Colorado Author/Creator: Geological Survey (U.S.) Publication/Creation: Washington : U.S. Govt. Print. Off, 1971 Resource Type: Book Is Part Of: U.S. Geological Survey bulletin, no. 1275-1278. Access & Availability: Loading
5. Utilization of mull (forest humus layer) in geochemical exploration in the Empire district, Clear Creek County, Colorado : sampling of the forest humus layer may be an effective geochemical tool in areas where the bedrock is covered by colluvium or glacial drift Author/Creator: Curtin, Gary C., 1935- author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1971 Resource Type: Book Access & Availability: Loading