John W Keller

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

Author

Series

Rock talk volume 5, no. 3

Pub. Date

2002.

2) Colorado mineral and mineral fuel activity, 2002

Author

Series

Information volume 67

Pub. Date

2003.

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

Author

Series

Open file report volume 03-19

Pub. Date

2005.

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

Author

Series

Information volume 78

Pub. Date

2015.

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

Author

Series

Information volume 68

Pub. Date

2004.