TY - RPRT TI - Tabulation of uranium and thorium data on the Mesozoic-Cenozoic intrusive rocks of known chemical composition in Colorado AU - George Phair AU - Lillie B. Jenkins PY - 1975 DO - 10.3133/ofr75501 UR - https://pubs.usgs.gov/publication/ofr75501 ID - ofr75501 ER -