Biographies provide useful genealogical information such as a person’s birth date and place; names of family members, including maiden names; education; occupation; and social, political, and religious affiliation. They may also contain a physical description of the person, previous residences, and immigration information. Biographies are the product of family knowledge or previous research about early settlers and prominent citizens of a state, county, or town. Local histories may contain biographical sketches of lesser-known people.
There are many published biographies of Maine residents at the Maine Historical Society. The Maine State Library also collects biographical materials.
To view what the Family History Library has go to Maine - Biography
Herdon, Richard, et al. Men of Progress: Biographical Sketches and Portraits of Leaders in Business and Professional Life in and of the State of Maine. Boston, Massachusetts: New England Magazine, 1897. (Family History Library book 974.1 D3m; film 1000057 item 2).
See the United States Biographies for information on nationwide biographical collections. See also the "History" and "Genealogy" sections for additional sources. You may wish to explore biography, history and genealogy sections in the wiki at county levels also.