Unit 731

In order

1. 1.
   

   Men Behind the Sun

   December 1, 1988

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2. 2.
   

   Men Behind the Sun 2: Laboratory of the Devil

   July 10, 1992

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3. 3.
   

   Men Behind the Sun 3: A Narrow Escape

   October 23, 1994

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4. 4.
   

   Black Sun: The Nanking Massacre

   July 7, 1995

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