Region
Japan
Japan --
19
United States
3
United States --
3
Asia, Southeastern
2
Asia, Southeastern --
2
China --
2
Afghanistan
1
Afghanistan --
1
Asia --
1
China
1
Italy
1
Japan. Rikugan. Kantogun. Butai, Dai 731 --
1
Korea
1
Korea --
1
Manchuria
1
Manchuria (China) --
1
Pacific Area
1
Singapore
1
Singapore --
1
Tokyo
1
United states --
1
Western countries
1
Western countries --
1
apan
1