Benjamin Band, Portland Jewry: Its growth and development (Portland: Jewish Historical Society, 1955). [link to pdf version, hosted by Documenting Maine Jewry]
Michael R. Cohen, “Adapting Orthodoxy to American life: Shaarey Tphiloh and the development of modern Orthodox Judaism in Portland, Maine, 1904-1976,” Maine History 44 (2009): 172-95.
Michael R. Cohen, “Portland: Jerusalem of the North” (undergraduate thesis, Brown University). [devotes particular attention to the history of Portland's synagogues and the struggle to establish a Conservative synagogue in the first half of the 20th century]
Documenting Maine Jewry, Oral History Project (oral histories collected in 2009).
Konnilynn G. Feig, Portraits of the past: The Jews of Portland (oral histories collected in 1976). [transcripts available in the Portland Room of the Portland Public Library; audio available through the Portland Public Library website]
Judith Goldstein, Crossing lines: Histories of Jews and gentiles in three communities (New York: Morrow, 1992). [a history of Jewish life in Bangor, Mount Desert Island, and Calais]
Michael Hoberman, How strange it seems: The cultural life of Jews in small-town New England (Amherst: University of Massachusetts Press, 2008). [link to Google Books version (full text online)]
David Lyon Hurwitz, “How lucky we were,” American Jewish History 87 (1999): 29-59. [memories of a Jewish camp in the Belgrade Lakes region]
Abraham J. Peck, “Is it good for the Jews? Is is good for everyone? Maine Jewry between civic idealism and the politics of reality,” Diversity at the ballot box: Maine’s minority communities, post-WWII to the present (Portland: University of Southern Maine, 2008). [link to pdf version]
Abraham J. Peck and Jean M. Peck, Maine’s Jewish heritage (Charleston, S.C.: Arcadia, 2007). (a photographic anthology) [link to Google Books version (full text online)]
Celia Risen, Some jewels of Maine: Jewish Maine pioneers (Pittsburgh: Dorrance, 1997).
“Haiman Philip Spitz, pioneer Maine merchant: An autobiography” (1886), excerpted by Jacob R. Marcus in Commentary 20 (1955): 50-56.