Paskow Science Fiction Collection Rare Books and Manuscripts Collection, Temple University Libraries. Over 2200 authors and editors represented by approximately 8000 titles. A few issues have been put online. Name for William J. Heron, a private collector. The Memory Hole Annex archive and repository of Science Fiction convention materials.
Most materials online are from recent years.
The world's largest open-shelf collection of science fiction .Open for public browsing, borrowing priveleges for members only. Com by Lee Skidmore. Lists Authors and works. Sales of publications with condition description. Probably a good place to visit if you are looking to purchase copies of out of print works.