© Courtesy of the Institute of Chinese Studies, Library, Heidelberg University.

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新智識叢書之一戰爭與進化, The new knowledge series, vol. 1: War and evolution

新智識叢書之三開戰時之德意志, The new knowledge series, vol. 3: Germany when the war started

新智識叢書之二發明與文明, The new knowledge series, vol. 2: Invention and civilization