Petroleum. Colorado Oil discoveries on Plum Creek, near Denver. Mining INDUSTRY & tradesman. v.9, #15 Oct. 1, 1891 p.150 Colorado oil fields. Ibid. p.151 Especially at Florence. DENVER Times May 6, 1891 p.17 Pt-3 (Excellent article). RMN Jan. 1, 1903 p.1 sec.16
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