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Are you James J. Callahan, author of the books below?
The Geometry of Spacetime by James J. Callahan Advanced Calculus by James J. Callahan The Killing of Ishi by James J. Callahan Calculus in Context by James J. Callahan Walls by James J. Callahan Aging and Disabilities by James J. Callahan 時空の幾何学―特殊および一般相対論の数学的基礎 by James J. Callahan


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