TY  - RPRT
TI  - Mining claim activity on federal land in the contiguous United States, 1976 through 2004
AU  - J. Douglas Causey
AU  - David G. Frank
PY  - 2006
DO  - 10.3133/ds228
UR  - https://pubs.usgs.gov/publication/ds228
ID  - ds228
ER  -