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USA | |
| www.libraries.psu.edu/emsl/guides/X/delaware.htm. |
| Mineralogy of Pennsylvania, S. Gordon, pg.186 |
| Reed, Juliet C., Annotated Bibliography of Minerals New to the Pennsylvania List - 1965-1974, Min. Soc. of PA, Inc. (1976): 70-71 Lapham, Davis M. and Geyer, Alan R. (1965), Mineral Collecting in PA, also (1969) edition. |
| American Mineralogist (1925): 10: 77 |
| Joe Dunleavy (Pers. Comm.) |
| Gordon's Mineralogy of Pennsylvania (1922) p. 191 |
| Gordon, Mineralogy of Pennsylvania, 1922 p. 190 |
| MacFall, P.M. (1951) Gem Hunter's Guide (1st ed.). Science and Mathematics Publishing Company, 187 pages. |
| Rocks & Min.:59:109-120. |
| Gordon, "Mineralogy of Pennsylvania," 1922 p. 195. |
| Rocks & Min.: 59:109-120 & 62:176-178. |
| Rocks & Min.: 59:109-120 & 62:176-178. |
| Reed, Juliet C., Annotated Bibliography of Minerals New to the Pennsylvania List - 1965-1974, Min. Soc. of PA, Inc. (1976): 70-71 Lapham, Davis M. and Geyer, Alan R. (1965), Mineral Collecting in PA, also (1969) edition. |
- Swarthmore (Borough of Swarthmore)
| Rocks & Min.: 59:109-120 & 62:176-178. |
Smedley Park beryl locality, Springfield Township, Delaware County, Pennsylvania, USA