Sawfish, I have some information from you from the 1980 Portland telephone directory, thanks to the good folks at the Multnomah County Library. Green Dolphin Books was at 215 SW Ankeny. Old Oregon Books was at 112 SW 2nd. Garvin and Levin was at 2724 E. Burnside. Those are the ones along with Powell's that I remember for used books. Looking Glass Books was a source for new books at 421 SW Taylor. T Holland's, mentioned by you but not known to me, was at 3522 SE Hawthorne. Cameron's: 336 SW 3rd. Wrigley Cross doesn't seem to be listed.