Exploration Methods on the Gogebic Range Open-file report; contains unpublished data that has not yet been peer-reviewed. Bedrock Geology Metallic Minerals Precambrian Bedrock Rocks and Minerals Data and Resources WOFR1923-04 Exploration Methods on the Gogebic Range Hotchkiss, W.O.; 1923 Report: 11 p. Download Related Collections Open-File Report View Open-File Report