Ullmer, E., 1975, Molybdenum trace analysis of certain phreatophytes as a biochemical prospecting method in the sedimentary basins of southern Arizona: Tucson, University of Arizona, M.S. thesis, 73 p.
Tucson, University of Arizona, M.S. thesis, 73 p.
Porphyry Copper, Molybdenum, Exploration, Biogeology,