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USA | |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey USGS |
| www.indiana.edu/~librcsd/etext/hoosier/IM-01.html. |
| |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
| Roland Schmidt Collection--Littleton, Colorado |
| Callaghan, E. (1948) Endellite deposits in Gardner Mine Ridge, Lawrence County, Indiana: Indiana Dept of Conservation Bulletin 1, pages 6,8 and 15. |
| www.indiana.edu/~librcsd/etext/hoosier/IM-01.html. |
| www.indiana.edu/~librcsd/etext/hoosier/IM-01.html. |
Bedford, Lawrence County, Indiana, USA