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USA | |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
| Erd(1960). American Mineralogist (1957): 42: 309-333. Rocks & Min.:61:148 |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey American Mineralogist (1957): 42: 309-333. |
| Erd, Richard C., Evans, Howard T. Jr., and Richter, Donald H., 1957, Smythite, A New Iron Sulfide, and Associated Pyrrhotite from Indiana, American Mineralogist, 42: 309-333. |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
Brummett Creek, Monroe County, Indiana, USA