A Bleg

Okay, here's challenge to you all.

The NROTC almuni association at my old university is looking to load up Kindles or flash drives or some other media with books that every young officer ought to have in his library - with the rub that most (read "all") of them need to be free.

Having gone to Gutenburg.org's list of books, I was able to download versions of:

Mahan's Influence of Sea Power
Clausewitz On War
Sun Tzu Art of War
Corbett's Some Priciple of Maritime Strategy
Jomini's The Art of War
U.S. Grant's Memoirs
W.T. Sherman's Memoirs
U.S. Constitution
Declaration of Independence
De Tocqueville Democracy in America vol 1
The Federalist Papers
Adam Smith The Wealth of Nations

I know there are lot of other good reading materials out there that would make a nice library for these mids as they move into the fleet - pdfs like "One tribe at a time" and lots of other Navy and Marine official history type things that can be downloaded.

My question is this - what other books, writings, training manuals, etc, should I be looking for? Further, if you can, can you cite to a location?

If you have a couple of ideas that might cost a little, but are really important, toss those out, too.

Thanks!