I would be willing to do the following books for 1 credit each:
1.The green turtle Mystery by Ellery Queen the front and backcover is creased copyright 1971 I think
2. Mission to Moscow by Joseph E Davies
3. Long Long ago by Alexander Woollcott
4. The great Impersonation by E Phillips oppenheim
5. Journey into Fear by Eric Ambler
6.See Here Private Hargrove by Marion Hargrove the front cover is pulling away from the binding
7. The Tragedy of Y by Ellery queen the back cover is pulling away from the binding but the glue is so strong that it is still sturdy.
All of these are copywritten 1945'ish Considering how old they they are they are in good shape. I would like one credit each for them.  A lot of them sold for not more than 60 cents orginally.

Do to the age I can not list them in the system, so you would have to buddy me credits.
 

I would check them on Amazon.Com or google rare/old book sites.  Also you can try Ebay.  I know that bookstores have access to places where they can get an idea of which books are worth more but I have no idea where they look.

I have checked some of my books here

http://www.cash4books.net/main.php

But I think looking at Amazon, eBay and Half.com would be good places to start.

Thanks for your help! I have listed the ones I am ready to part with. Thanks JEan

You can list older books here as long as they meet the posting guidelines.  If they don't have ISBN's then you just need to list them without one.