| bhbe | https://www.barharborbookshop.com | Bar Harbor Bookshop in Hulls Cove, Maine, has an excellent collection on-line and at their shop. |
| lt | https://www.librarything.com/home | Librarything is a free web-based book cataloging application. It has accumulated a large quantity of cover images, uploaded by its users and available for general use. |
| bookscans | http://www.bookscans.com | Bookscans is a fantastic resource for images of paperback book covers from 1939 to 1979. |