John W Keller

1) Industrial minerals: what are they, where are they, and what good are they?

Author
Keller, John W
Series
Rock talk volume 5, no. 3
Publisher
Colorado Geological Survey
Pub. Date
2002.

2) Colorado mineral and mineral fuel activity, 2002

Author
Keller, John W
Series
Information volume 67
Publisher
Colorado Geological Survey, Division of Minerals and Geology, Department of Natural Resources
Pub. Date
2003.

3) Geologic map of the Manitou Springs quadrangle, El Paso and Teller counties, Colorado

Author
Keller, John W
Series
Open file report volume 03-19
Publisher
Colorado Geological Survey, Division of Minerals and Geology, Department of Natural Resources
Pub. Date
2005.

4) Colorado mineral and energy industry activities in 2014-2015

Author
Guilinger, Jim
Series
Information volume 78
Publisher
Colorado Geological Survey
Pub. Date
2015.

5) Directory of active and permitted mines in Colorado-2002

Author
Guilinger, Jim
Series
Information volume 68
Publisher
Colorado Geological Survey, Division of Minerals and Geology, Department of Natural Resources
Pub. Date
2004.