Einheitliche Theorie von Gravitation und Elektrizität. EINSTEIN (Albert). & MAYER (Walther).
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First separate edition. 8vo. 19, [1, blank] pp. Original printed wrappers. Berlin, Verlag der Akademie der Wissenschaften in Kommission bei Walter de Gruyter u. Co., Sitzungsberichten der Preussischen Akademie der Wissenschaften Phys.-Math. XXV. An original offprint of Einstein's article 'Unified Theory of Gravitation and Electricity' co-authored with the Austrian mathematician Walther Mayer (1887-1948).
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