Now that I am ubber-organized :-) I find that I have several duplicate titles in these types of books.  Some have dust jackets, but none are in *really* good shape. The books themselves are in good shape (for their age).

These books are distinctive in the type of binding/paper used. They appear to be a normal (old) hard-back edition, but are VERY light for their size, and the pages tend towards yellowing and/or stiffness. I'm told it's a war-time paper restriction. These are 1940s publications. Whitman is the only publisher I can think of off the top of my head.

If you are interested in a list of titles, or if you are looking for specific titles, please send me a PM and we can work out a deal. 

Are they juvenile fiction?

I sent you a PM asking about titles. Thanks!