SUBSCRIBE TO TPG In Memoriam, continued from p. 47
Cori Hoag, CPG-11205, writes: I was his 100th graduate student and he had a profound impact on my life and professional development.
Spence presented me with a copy of his 1982 Advances in Geology of the Porphyry Copper Deposits (AKA green Titley vol- ume, green Bible) when I graduated as his 100th graduate student in 1991 (M.S. Economic Geology). I referred to the comprehensive deposit articles in both publications countless times working as an Arizona-based exploration, mine development, and environ- mental geologist in the copper mining industry.
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