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Water current meters. Meters used to measure water I
Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.
Water current meters. Meters used to measure water II
The Theodor Horydczak Collection documents the architecture and social life of the Washington DC metropolitan area in the 1920s, 1930s, and 1940s.
Water current meters. Meters used to measure water II
Public domain photograph of 1940s-1950s America, free to use, no copyright restrictions image - Picryl description