I am sick of re-editing the T-90 page. Khazar don't you think this is reliable enough?http://www.amazon.com/Soviet-Russian-Artillery-Design-Practices/dp/1892848015/ref=sr_1_2?ie=UTF8&qid;=1423151997&sr;=8-2&keywords;=soviet+russian+armor+and+artillery+design+practices Page 125http://gall.dcinside.com/board/view/?id=arm&no;=375130&page;=1