Family Search Books
Hathi Trust Digital Library
Internet Text Archive
Heritage Quest Online
HeritageQuest is a genealogical resource offered for free by many libraries across the United States and Canada. Most participating libraries even offer their patrons remote access from a home computer. The HeritageQuest book collection includes about 22,000 digitized family histories and local histories. Books are every-word searchable, or can be viewed page by page in their entirety. Downloading is limited to 50 pages, however. You generally won't be able to search HeritageQuest directly through this link - instead check with your local library to see if they offer this database and then connect through their site with your library card.
Canadian Local Histories Online(Subscription)
The Our Roots project bills itself as the world's largest collection of published Canadian local histories. Thousands of digital copies in French and English are available online, searchable by date, subject, author or keyword.
There are a lot of genealogy and local history books from around the world in the online Rare Genealogical and Historical Digitized Book Collection of subscription-based site, World Vital Records. This includes over 1,000 titles from Genealogical Publishing Company (including many focused on early American immigrants), several hundred books from Archive CD Books Australia (books from Australia, England, Scotland, Wales & Ireland), 400+ family history books from Canadian publisher Dundurn Group, and almost 5,000 books from Canadian-based Quinton Publications, including genealogies, local histories, Quebec marriages and biographical collections.
Ancestry.com - Family & Local History Collection (subscription)
Journals, memoirs and historical narratives, plus published genealogies and record collections make up the bulk of the 20,000+ books in the Family and Local Histories collection at fee-based Ancestry.com. Among the offerings are the Daughters of the American Revolution Series, slave narratives, biographies, genealogies and more gathered from genealogical society collections from around the U.S., as well as the Newberry Library in Chicago, the Widener Library at Harvard University, the New York Public Library, and the University of Illinois at Urbana. See the Family and Local Histories Learning Center for instructions and tips on how to best use the collection.
Search historical books from the 18th and 19th centuries, including digitized versions of all available books, pamphlets and other publications printed in America before 1819.
Their Own Words
A digital collection of books, pamphlets, letters, and diaries, dating from the latter eighteenth through the early twentieth century, that reflects the history of the United States. The 50+ books in the collection include a few biographies, autobiographies, and military journals and regimental histories.