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sekiyu sangyō-nihon

Nihon sekiyu sangyō no kyōsōryoku kōchiku

By Takeo Kikkawa

Senzen Nihon no sekiyu kōbōsen

By Takeo Kikkawa

日本軍はなぜ満洲大油田を発見できなかったのか

By 岩瀬昇