First, my thanks for the many excellent responses to my previous query.
(Sometimes I wonder if I rely on the good graces of the folks on this LIST
too much.)

I am getting ready to select illustrations for a book project and I am
trying to figure out free sources, since the publisher will not pay for the
rights to my illustrations.  Any advice on where to look?  I know about
Library of Congress.  And I would love some pictures that are relatively
unknown -- not the standard ones that show up all the time.  Any good ideas
for images that are in the public domain?

PS -- I am not against paying a little for rights, but some rights are more
expensive than others.

Harold K. Bush, Ph.D
Saint Louis University