210 maps
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USGS historical 15-minute topo (1948)
USGS historical 15-minute topo (1918)
USGS historical 15-minute topo (1943)
USGS historical 15-minute topo (1954)
USGS historical 15-minute topo (1950)
USGS historical 15-minute topo (1942)
USGS historical 15-minute topo (1955)
USGS historical 15-minute topo (1962)
USGS historical 15-minute topo (1919)
USGS historical 15-minute topo (1945)
USGS historical 15-minute topo (1957)