I am trying to find historic images of san diego. The san diego digital library(linked sited) seems to have only library images
Thsnk you for your query. Please follow this link: http://www.sandiegohistory.org/online_resources/gallery.html. It is from the San Diego Historical Society.
As far as high quality digital images, Google Images (images.googles.com) can also be of good use. Using keywords "historic san diego," you will see a good selection of images. Also, the Special Collections section at the Central library has unique photographs of historic San Diego.
Feel free to contact the Central Library directly at (619) 236-5800 for further information.
Interlibrary Loan Section
San Diego Public Library
820 E St.
San Diego, CA 92101