This four volume set published in 1909 has over 2,000 pages of genealogical and family history information for the state of Maine. The books are freely available and searchable.
——————————————————————————————————————–
1909 Vol I [ digital copy ] [ searchable full text copy ]
1909 Vol II [ digital copy ] [ searchable full text copy ]
1909 Vol III [ digital copy ] [ searchable full text copy ]
1909 Vol IV [ digital copy ] [ searchable full text copy ]