PDF 
    G27 Vol. 1 Ophir - East Item Info
Source
    - Preferred Citation:
 - "G27 Vol. 1 Ophir - East", Butte Stope Books, Montana Bureau of Mines and Geology
 - Reference Link:
 - https://mbmg.mtech.edu/Information/Collections/Butte-Stope-Books/items/bsb003.html
 
Rights
    - Rights:
 - In Copyright - Educational Use Permitted.
 - Standardized Rights:
 - http://rightsstatements.org/vocab/InC-EDU/1.0/