Well, that was a LOT easier to find than I expected. The public access to the NASA library is at
Public Visitor's Page for NASA Langley Technical Library
There are a LOT of technical reports done after WW-I on Allied and Central Powers aircraft as an effort to discover any useful technologies that were developed by the warring nations.
Have fun and please let the rest of the group see where you find anything useful to us in our replicas!
This has to be one of the more "unusual" spin-off from the space program!
Hank