Landships II

Project Gutenberg and the Internet Archive have quite a few. For example: 

A Company of Tanks by William Henry Lowe Watson

There are some links to downloadable scanned manuals of WW1 equipment at:

http://landships/landships/reference.html?load=Reference/Manuals.html

[I must update the list there are lots more in the on line collection of the Victoria State Library.]

If you really want to annoy the Wikipedia troglodytes start quoting from the original equipment manuals, especially

if they are in French - they can't dispute it but hate it.

Charlie

You might want to look at the Russian site Yellow House Club at https://vk.com/yellowhouseclub.  Although in Russian, you can set it up to automatically translate into whatever language you want.  While aimed at the modeler, their are plenty of downloadable books in all languages and military topics.

Boson Al