Howdy all,
I'd noticed Phils query below "searching for Williams 2nd edition" and thought we could toss out a few of our favorite book sources. I'll go first (duh, it's my idea..):

absolutely the nicest guy ever and has it or can put his hands on it:
http://www.zoobooksales.com/

this is Russ Gurley (you turtle people know him) - incredible inventory of odd papers and minor runs:
http://www.livingartpublishing.com/

the last word in herp books - amen:
http://www.herplitsales.com/

Lacks a search option (well, I can't find it) but worth a look:
http://www.krieger-publishing.com/natscience/herpetology/herpetology.html

Phil, if you haven't checked zoobooks already, contact them and he'll point you in the right direction....
-Jeff
-----
Let there be triangulum and lo, the milkhead was born.