The Internet Archive San Francisco tours on Fridays at 1pm are getting more and more people. So fun. 300 Funston Ave.

Here are some other tiny bookie non-profits in San Francisco...

Letterform Archive https://letterformarchive.org/

Prelinger Library
https://prelingerlibrary.org/home/

San Francisco Center for Book
https://sfcb.org

The Whybrary

Mechanics Institute Library
https://www.milibrary.org/

im sure I am missing some....