Peter Coggins mentions a book dealer's web page that has "Interloc" in
its URL.  That suggests that this dealer is a subscriber to Richard
Weatherford's Interloc system, which is a large -- if not the largest
-- Internet-based clearing house in which antiquarian (out-of-print)
book dealers advertise their wares and their wants to other antiquarian
dealers in order to match buyer and seller.

Almost any book you can think of is out there for sale in someone's
stock.  The problem is to match seeker with owner, so that a sale can
be made.  Interloc, and services like it, perform that matching
function with an efficiency and a success rate that couldn't be
equaled by the old hard-print standbys like Antiquarian Bookman
and Bookman's Weekly.

Mr. Weatherford entered the electronic antiquarian book field in the
early days of the Internet with a service called BookQuest, but that
never got off the ground, mostly due, I suspect, to his not achieving
"critical mass."  But he has done it now with Interloc, which is a
thriving success.

If you are looking for a copy of any out-of-print book, I suggest
you contact a second-hand book dealer who is a member of Interloc or
a similar online matching service, tell him what book you are looking
for, and let him locate a copy for you.  Your chances of success, if
you are patient, are very good.

Matthew Caulfield (a book man, but not a flack for Interloc)

 [ Matthew is trying to retire, finally, from many years of service at
 [ Rare Book and Special Collections Division of Library of Congress.
 [ -- Robbie