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1)
Amendment to Metal mining and tourist era resources of Boulder County: multiple property listing
Author
Twitty, Eric
Publisher
[Office of Archaeology and Historic Preservation, Colorado Historical Society]
Pub. Date
[2007]
Language
English
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2)
Guide for evaluating historic resources in the I-70 Mountain Corridor Colorado
Author
Twitty, Eric
Publisher
Mountain States Historical
Pub. Date
2011.
Language
English
eBook
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3)
Colorado mining history: resource guide
Author
EchoHawk, Dana
Publisher
Center for Colorado & the West at Auraria Library
Pub. Date
2013.
Language
English
eBook
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