I probably can't help you with the print (especially if it is later 20th Century), but if you want to e-mail it to me I can put it on-line (brobeck at ns dot sympatico dot ca ).
OTOH, there is a very good print forum
http://www.mtsu.edu/~art/printmaking/wwwboard/index.html where you might be able to chase down more info.
Cheers;
Chris