210 maps
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USGS historical 15-minute topo (1943)
USGS historical 15-minute topo (1918)
USGS historical 15-minute topo (1952)
USGS historical 15-minute topo (1946)
USGS historical 15-minute topo (1951)
USGS historical 15-minute topo (1923)
USGS historical 15-minute topo (1935)
USGS historical 15-minute topo (1917)
USGS historical 15-minute topo (1920)
USGS historical 15-minute topo (1948)
USGS historical 15-minute topo (1940)
USGS historical 15-minute topo (1955)
USGS historical 15-minute topo (1950)
USGS historical 15-minute topo (1961)
USGS historical 15-minute topo (1959)
USGS historical 15-minute topo (1953)
USGS historical 15-minute topo (1962)