I bought this a couple weeks ago.
It's an invaluable resource if you are a researcher or interested in all aspects of the US submarine war.
I learned something in the first five minutes of reading this cd. Each subamrine had special protractors supplied to help determine the angle on the bow. I don't recall ever reading this in any of the 150 books I have on submarine warfare. Below is the page from ONI-208J with this information...
