Archive.org has a large number of old county histories and other genealogy type books scanned and in a variety of digital formats for genealogists. Search for "yourcountyname county yourstatename" and see what materials are available.
Remember that some books might have been scanned and placed on Archive.org by more than one person, so it's possible that another scan might be better, have that missing page, etc.
And don't forget that once you've found the book on Archive.org there are a variety of ways to download it, search it, etc.
And reading parts of it might be good too.