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USGS - Historic Quads
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Berthoud Pass 1957/1964 (ver. 2)
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USGS - Historic Quads
Berthoud Pass 1957/1964 (ver. 1)
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USGS - Historic Quads
Berthoud Pass 1957/1959 (ver. 2)
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USGS - US Topo
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USGS - US Topo