98 maps
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USGS historical 15-minute topo (1919)
USGS historical 15-minute topo (1941)
USGS historical 15-minute topo (1918)
USGS historical 15-minute topo (1943)
USGS historical 15-minute topo (1939)
USGS historical 15-minute topo (1915)
USGS historical 15-minute topo (1952)
USGS historical 15-minute topo (1913)
USGS historical 15-minute topo (1911)