TY - BOOK AU - Marvin, Richard F. CN - QE75 CN - QE75 CY - Washington, DA - 1973. ID - 229403 KW - Radioactive dating KW - Igneous rocks KW - Geology PB - U.S. Govt. Print. Off., PP - Washington, PY - 1973. T1 - Radiometric ages of igneous rocks from Pima, Santa Cruz, and Cochise Counties, southeastern Arizona, TI - Radiometric ages of igneous rocks from Pima, Santa Cruz, and Cochise Counties, southeastern Arizona, VL - 1379 ER -