Biotite from York County, Maine, USA
USA | |
| King, Van (n.d.) Personal communcation. |
| Gilman, R. (1978) Bedrock Geology of the Newfield 15' Quadrangle, Maine. Maine Geological Survey, OF-78-10. |
| Hussey, Arthur M. - The geology of southern York County, Maine (1962) |
| Wandke, A., 1922, A Petrologic Study of the Cape Neddick Gabbro, A, J Sci fifth series 4:295-304 |