Allows you from one web site to search the following (each is done as a
separate search):
ILAB - The International League of Antiquarian Booksellers ABAA - The Antiquarian Booksellers' Association ABE - Advanced Book Exchange AddALL - multi-site book search. Will sort the results by author, title, price, or site
Alibris Antiqbook - fewer books but will list some European dealers not found on on other sites. Bookfinder - Multi-site book search. Back Issues - for magazines
Now the ABAA search doesn't work, but it does get you to the ABAA site.
The separate searches can be made easier by judicious use of the Back button
(i.e. do a search, see results, use the back button to go to the search screen,
cut the text you're searching on, click on next search, paste search text
in appropriate field).
Hope this is useful.
Chris Mauchline SE PA, zone 6 40° 5' N 75° 51'W ~650 ft elevation