TY  - RPRT
TI  - U-Pb dating of uranium deposits in collapse breccia pipes of the Grand Canyon region
AU  - K.R. Ludwig
AU  - K. R. Simmons
PY  - 1992
DO  - 10.2113/gsecongeo.87.7.1747
UR  - https://pubs.usgs.gov/publication/70016841
ID  - 70016841
ER  -