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    • EPCD, drilling from column

    • A worker operates a compressed air, percussion-type rock drill near the East Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel), of the Colorado-Big Thompson Water Diversion Project, in Grand County, Colorado. The man wears a safety...
    • Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Boring--Colorado--Grand County--1940-1950.; Construction workers--Colorado--Grand County--1940-1950.; Drilling & boring machinery--Colorado--Grand County--1940-1950.;...
    • [between 1940 and 1944?]

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