TY - RPRT TI - Calculated in situ rock density from gravity observations, UA-1 (Cannikin) emplacement hole, Amchitka Island, Alaska AU - D.L. Healey PY - 1971 DO - 10.3133/70156927 UR - https://pubs.usgs.gov/publication/70156927 ID - 70156927 ER -