The best manual I have seen in wargaming /tank smulation gaming industry was from
Microprose Across the Rhine tank/strategy simulation. The game wasn't that great, but
the manuals were really top class. I still keep them today. First manual was gameplay manual, the second one was historical manual with a lot of info on battles that were fought on Western Front from 1944 to 1945,
this include battle reports, OOBs. There was also a section about Allied and German armor, really good readings. I would like to see a good manual too
Peter