780Af0110: "Concrete lining of Gage Canal at Riverside, California"
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This negative is of a photograph. Title information from "Seepage Losses from Irrigation Channels" by Carl Rohwer and Oscar Van Pelt Stout (Figure 26) and "Canal Lining Manual" by Carl Rohwer. See Figure 36, which reads, "View of a portion of the 3/4 inch concrete lining of Gage Canal taken in 1923 when lining was 30 years old."