Epsomite from Montana, USA
USA | |
| Gobla, Michael J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87 (3) 208-240 doi:10.1080/00357529.2012.676825 |
Rocks and Minerals V.74 No.3 p.190,191 | |
| The Mineralogy of The Butte District, Montana Guilbert and Zeihen 1964 |