In reading a G2G posting, a member commented they “blundered” into an old published genealogy on the website archive.org.
Archive.org is an important source for out of print, out of copyright family histories and county histories. Anyone can download full length books as PDFs or other formats (I have found the versions that have been converted to text files usually have ocr character interpretation problems, and are much less useful). I have used it frequently, and have put together a moderate sized personal electronic library of books I could never afford to buy.
For ready reference you can printout and bind key parts of these for ready reference.
Alternately, if you own Adobe Acrobat, not just the free Acrobat Reader, you can bookmark the key sections.