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USA | |
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| Pavlides, Louis and Milton, Charles, 1962, Geology and Manganese Deposits of the Maple and Hovey Mountains Area, Aroostook County, Maine, U. S. Geological Survey Professional Paper 362, pp. 116 + plates. |
| Pavlides, Louis and Milton, Charles, 1962, Geology and Manganese Deposits of the Maple and Hovey Mountains Area, Aroostook County, Maine, U. S. Geological Survey Professional Paper 362, pp. 116 + plates. |
- Blue Hill - Castine Mining District
| Douglas Watts specimen |
| King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
| Morrill & Hinckley, 1959. Maine Mines & Mineral Localities, Vol. 2. |
Black Hawk Mine, Blue Hill, Blue Hill - Castine Mining District, Hancock County, Maine, USA