235 maps
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USGS historical 15-minute topo (1918)
USGS historical 15-minute topo (1960)
USGS historical 15-minute topo (1940)
USGS historical 15-minute topo (1930)
USGS historical 15-minute topo (1956)
USGS historical 15-minute topo (1934)
USGS historical 15-minute topo (1943)
USGS historical 15-minute topo (1957)
USGS historical 15-minute topo (1947)
USGS historical 15-minute topo (1922)
USGS historical 15-minute topo (1938)
USGS historical 15-minute topo (1949)
USGS historical 15-minute topo (1942)
USGS historical 15-minute topo (1923)
USGS historical 15-minute topo (1937)