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    • Mt. Logan retort Simplex

    • View of an oil shale processing facility (a retort) near De Beque (Mesa County) Colorado; shows sheds, ore cables, chutes, and pipes on a hillside.
    • Oil-shale industry--Colorado--De Beque--1900-1920.; De Beque (Colo.)--1900-1920.; Industrial facilities--Colorado--De Beque--1900-1920.; Petroleum industry--Colorado--De Beque--1900-1920.
    • [between 1900 and 1920?]

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