1. Farish, W. A. (May 4) 1905b. Report on the Gregory‐Bobtail‐Fisk‐Mammoth group of mines owned by the Kingdom of Gilpin Mines, Inc. at Black Hawk and Central City, Colorado. Copy in author's library
2. Farish, W. A. (May 28) 1905c. Personal letter ‘to O.B. Thompson’ on the Gregory‐Bobtail‐Fisk‐Mammoth group of mines owned by the Kingdom of Gilpin Mines, Inc. at Black Hawk and Central City, Colorado. Copy in author's library