Gold mining in Colorado (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Gold mining in Colorado" in English language version.

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books.google.com

Leonard Jr., Robert D.; Hallenbeck, Ken L.; Wilde Jr., Adna G. (2017). "The Cripple Creek Mining District". Forgotten Colorado Silver: Joseph Lesher's Defiant Coins. Charleston, SC: History Press. pp. 9–10. ISBN 9781625857965. Retrieved 8 April 2020.
R. L. Herrick, Roosevelt Tunnel, Mines and Minerals, Vol. XXIX, No. 9 (April, 1909), page 387.]
J. E. Murphy, Tunnel Unwaters Famous Gold District, Popular Mechanics, Vol. 32, No. 5 (Nov. 1919); pages 742-743.

"2017 Annual Report and Form 10-K" (PDF). Greenwood Village, Colorado: Newmont Mining Corporation. 22 February 2018. p. 31. Retrieved 24 May 2018.

MacKell, Jan. "VITALS: Cripple Creek Colorado Mining District Deaths". usgwarchives.net. Retrieved February 28, 2020.