Filters: Types: Map Service (X) > Date Range: {"choice":"month"} (X) > Tags: {"type":"category","scheme":"http://www.sciencebase.gov/vocab/undefined/DenverHistoryPhotoLibrary/Categories","name":"specimens"} (X)
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Specimens showing injection gneiss formed by intimate intrusion of quartz biotite schist of the Idaho Springs formation by granite pegmatite; taken from dump of Golden Rod tunnel, Silver Creek. Gilpin County, Colorado. Circa 1911. Plate 10-B, natural size, in U.S. Geological Survey Professional Paper 94. 1917.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Bastin, E.S. Collection,
Gilpin County, Colorado,
Photographers,
Specimens,
photo print
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