1957. United States Geological Survey.
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1957. United States Geological Survey.
1954. Stamped in black with John E. Brush Map Library. United States Geological Survey.
1952. Stamped in black with John E. Brush Map Library. United States Geological Survey.
1953. United States Geological Survey.
1946. United States Geological Survey.
1954. United States Geological Survey.
1954. United States Geological Survey.
1949. United States Geological Survey.
1954. United States Geological Survey.
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