I managed to acquire a couple of Sayama Jiro’s books about Japanese small arms and some anti tank equipment for cheap! Looking forward to reading through them! 
(left) Shoju Kenju Kikan Ju Nyumon Nippon No Shokaki Tettei Kenkyu Shinso Kaisetsu Ban, (right) Nippon Rikukai Gun No Taisen Sha Sen
I’m sure if I find anything particularly interesting you’ll be hearing from me again soon enough on here.
Also on the note of books? Anyone else know some great books about Japanese Equipment?