12th
Now here’s a little hack I sort of stumbled across. WorldCat is essentially the library catalog of ALL the public library catalogs in the U.S. It tells you which libraries have which books. And Sonoma County library can request all these books via Inter-Library Loan.
In this case I used its “subject” search and found that WorldCat shows 4,000+ books on “older persons housing”. Click on any one of the books and you get basic information PLUS a listing of all the libraries that have it, with their mileage measured from my place in Forestville.
So prowl the list for anything that strikes your fancy. If Sonoma County Library (or SSU) shws up, you can just request it normally. If not, you can ask Sonoma County Library to borrow the book for you and have it delivered to your closest branch, just as you do with local books.
Enjoy.