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USA | |
| Cameron, Eugene N., , (1954) Pegmatite investigations, 1942-45, in New England. Professional Paper 255. US Geological Survey doi:10.3133/pp255 P Cristofono collection Cameron, Eugene N. |
| Cameron, Eugene N., , (1954) Pegmatite investigations, 1942-45, in New England. Professional Paper 255. US Geological Survey doi:10.3133/pp255 King, V. (ed), 2009, Maine Feldspar, Families, and Feuds. Cameron, Eugene N. |
| King, V. (ed), 2009, Maine Feldspar, Families, and Feuds. |
| Cameron, Eugene N., , (1954) Pegmatite investigations, 1942-45, in New England. Professional Paper 255. US Geological Survey doi:10.3133/pp255 P Cristofono collection Cameron, Eugene N. |
| Cameron, Eugene N., , (1954) Pegmatite investigations, 1942-45, in New England. Professional Paper 255. US Geological Survey doi:10.3133/pp255 Cameron, Eugene N. |
| www.mindat.org (n.d.) https://www.mindat.org/gallery.php?loc=3779&min=6683 Found and confirmed during ongoing study of Ryerson Hill by Lloyd W. Alexander 2021 |
| Cameron, Eugene N., , (1954) Pegmatite investigations, 1942-45, in New England. Professional Paper 255. US Geological Survey doi:10.3133/pp255 Cameron, Eugene N. |
| Tim Blake, Lookout Mine Owner |
| AmMin 36:869-883 (1951) |
| Cameron, Eugene N., , (1954) Pegmatite investigations, 1942-45, in New England. Professional Paper 255. US Geological Survey doi:10.3133/pp255 Cameron, Eugene N. |
Bumpus Quarry, Albany, Oxford County, Maine, USA