
Agricultural development and early mining activity define the landscape of eastern Boulder County during the earliest years of the twentieth century. The town of Longmont serves as a primary hub, situated near the confluence of St. Vrain Creek and its various irrigation channels, such as the Highland Ditch. To the south, the coal mining heritage of the region is evident near Erie, where the Gladstone Mine and Hayward Mine are located.
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3 editions found
1890 · East Denver
USGS Topo · 1:125,000
1899 · West Denver
USGS Topo · 1:125,000
1902 · Greeley
USGS Topo · 1:125,000
1902 · Boulder
USGS Topo · 1:62,500
1904 · Boulder
USGS Topo · 1:62,500
1905 · Mount Olympus
USGS Topo · 1:62,500
1906 · Blackhawk
USGS Topo · 1:62,500
1906 · Loveland
USGS Topo · 1:62,500
1907 · Mount Olympus
USGS Topo · 1:62,500
1908 · Loveland
USGS Topo · 1:62,500