FamilySearch Digital Library offers access 550,000+ digitised genealogy and family history books and publications including family histories, county and local histories, genealogy magazines, gazetteers, medieval histories and pedigrees. The digital books are fully text searchable and you can filter search results to focus quickly on relevant books. The book images and pages load quickly plus there is digital page turning that feels more like a real book.
TIP: Use this site because unlike other eBook sites it only has family history titles and it is a great place to search.
Note: You need to log in with a free FamilySearch Account to use FamilySearch.