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| Morrill (1958) Maine Mines & Minerals: Vol 1 - Western Maine.
Fisher, L.W. (1934) Graphite In Pegmatite. American Mineralogist, 19(4), 169-177. |
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| Douglas Watts |
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| Korsakov, Andrey V., Olga V. Rezvukhina, John A. Jaszczak, Dmitriy I. Rezvukhin, and Denis S. Mikhailenko. (2019) "Natural Graphite Cuboids" Minerals 9, no. 2: 110. https://doi.org/10.3390/min9020110
Thompson, Woodrow B., Bearss, Gene T., Falster, Alexander U., Simmons, William B., Nizamoff, Jams W. (2000) The Estes Quarry, Cumberland County, Maine: A New Pegmatite Mineral Locality. Rocks & Minerals, 75 (6) 408-418 doi:10.1080/00357520009605667 |
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| King, Vandall T. (2000) Mineralogy of Maine Vol. 2 - Mining History, Gems, and Geology. Maine Geological Survey. |
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| Smith, George Otis (1906). Graphite in Maine, Contributions to Economic Geology, 1905 (USGS Bulletin 285). |
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| American Mineralogist 61:431-434, 1976 |
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| Miller, B. L. (1912). Graphite deposits of Pennsylvania (Pennsylvania Topographic and Geologic Survey Commission), p. 47. |
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| King, Vandall T. (2000) Mineralogy of Maine Vol. 2 - Mining History, Gems, and Geology. Maine Geological Survey. |
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| Thompson, Woodrow B., Joyner, Ronald L., Woodman, Raymond G., King, Vandall T. (1998) Bulletin (41), A Collector's Guide to Maine Mineral Localities (3rd ed.) Maine Geological Survey |
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| Thompson, Woodrow B., Joyner, Ronald L., Woodman, Raymond G., King, Vandall T. (1998) Bulletin (41), A Collector's Guide to Maine Mineral Localities (3rd ed.) Maine Geological Survey |
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| King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
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City quarry, Lewiston, Androscoggin County, Maine, USA