Directory of mining enterprises.
| Item Description: | Volumes for 1953-57 issued as the bureau's Information circular (QE133.A27); 1958- as its Bulletin. |
|---|---|
| Physical Description: | volumes : maps, tables. |
| Related Items: | Vol. for 1958 includes the Mineral industry of Montana, 1958. Preliminary annual report. Vols. for 1966- includes List of active coal mines and a section on the Mineral industry of Montana. |