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USA | |
| Stose, George W. and Bascom Florence (1932) The Geology and Mineral Resources of Adams County, Pennsylvania, USGS Bulletin 136, pp. 124. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |