Polybasite from Lewis and Clark County, Montana, USA
USA | |
| Dana 7:I:352,355. |
| Szarkowski, J. (2019). Resource Estimation and Simulation at West Butte in the McDonald Gold Deposit Near Lincoln, Montana. Montana Tech of The University of Montana. Masters thesis. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |