Advice on Spec Books

["larry_l_doub" <nftrains@n...>]

I have a hand full of Locomotive Specification books for U-boats and 
was wonering what a fare selling price is for these?
I have heard they go for up near 20.00 each depending on what unit 
there for, and i have seen some in ebay go up-words of 40.00,
U23B and U23c are a couple, and "think" i have U25s and maybe 27s, I 
would have to 
dig them out to make sure but that is around about what i have.
Anyone help me out?

larry Doub