710Be0223: "Finishing jumbo, Madera Canal, Central Valley Project, California"
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This negative is of a U.S. Bureau of Reclamation photograph. Title information from "Canal Lining Manual," by Carl Rohwer, 1946. See Figure 39, which further notes that the jumbo "follows immediately behind placing machine" and "provides a framework from which the finishers repair defects and trowel the surface."