- found: LC database, 12-1-94 (usage: Ninja; Ninjas)
- found: Random House (Ninja)
- found: World Book: under Martial arts (Ninja)
- found: Hennepin (Ninja)
- found: Amer. heritage dict. (Ninja; pl. Ninja or Ninjas)
- found: Kodansha encyc. of Japan: under ninjutsu (ninja)
- 1994-12-01: new
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