Japanese Army Shooting Practice Handbooks Set of 4 1939

This is an authentic set of four pocket handbooks of the Japanese Army, dated July 1939 (per Google Translate app) covering shooting practice.  The books contain a number of illustrations of firing ranges, shooting positions, targets, firing trajectory, and ranges. About half of the pages are foldouts with charts and illustrations. Unfortunately, we are unable to translate this manual and cannot provide any additional information regarding its content.

All of the pages appear to be present.  Each page appears to be clean, but a few have red ink mark-ups. Measures ~ 5 inches by ~3.5 inches wide and ~1/4 inch thick.