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Description:23 00 48 00 Denver, Colorado. Seen on snowy mountains, construction of a tunnel through Rockies, mountain range. Big works, transport, communications. Seen on camp, Minors, workers go on the work with wagons on rails. Minors get out of the tunnel in construction with wagons filled with stones, rubbles. Extraction. Seen on crane, excavator inside the tunnel which digs. Perforing. Internal sight of the mine, construction site, workers on wagon with horse crosses the tunnel with torch. Workers dig gallery.
