175 maps
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USGS historical 15-minute topo (1914)
USGS historical 15-minute topo (1943)
USGS historical 15-minute topo (1951)
USGS historical 15-minute topo (1958)
USGS historical 15-minute topo (1959)
USGS historical 15-minute topo (1916)
USGS historical 15-minute topo (1950)
USGS historical 15-minute topo (1910)
USGS historical 15-minute topo (1956)
USGS historical 15-minute topo (1936)
USGS historical 15-minute topo (1904)
USGS historical 15-minute topo (1906)
USGS historical 15-minute topo (1949)