TY - RPRT TI - Method for determining the age of igneous rocks using the accessory minerals AU - E.S. Larsen AU - N.B. Keevil AU - C. Harrison PY - 1952 DO - 10.1130/0016-7606(1952)63[1045:mfdtao]2.0.co;2 UR - https://pubs.usgs.gov/publication/70221616 ID - 70221616 ER -