There are a number of websites that have digitized genealogy and family history books, such as compiled surname genealogies, locality history and records, etc.:
1) Google Books (https://books.google.com) - has over 30 million digitized books free to access.
2) Internet Archive (https://archive.org/) - has over 10 million digitized books free to access.
3) HathiTrust Digital Library (https://www.hathitrust.org/) - has over 14 million digitized books free to access.
4) MyHeritage Books and Publications (https://www.myheritage.com/research/category-8020/books-publications) - has over 447,000 genealogy-related digitized books free to access.
5) FamilySearch Books (https://books.familysearch.org/) - has over 280,000 genealogy-related digitized books and manuscripts free to access:
6) Genealogy Gophers (https://www.gengophers.com/#/) - has over 80,000 genealogy-related digitized books free to access.
7) Ancestry (http://www.ancestry.com) - has over 23,000 digitized genealogy-related books, not free to access).
8) GenealogyBank (http://www.genealogybank.com) - has over 14,000 digitized genealogy-related books, not free to access).
Each site has a different set of search fields and search options (e.g., wild cards, exact matches, included words, excluded words).
There are other digitized books websites with significant genealogy and family history hol;dings - which ones should I add to this list?