Hyland, Fay, Woodrow B. Thompson, and Robert Stuckenrath, Jr. “Late Wisconsinan Wood and Other Tree Remains in the Presumpscot Formation, Portland Maine”. Atlantic Geoscience 14, no. 3 (December 1, 1978). Accessed March 29, 2024. https://journals.lib.unb.ca/index.php/ag/article/view/1966.