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1922//1925, The Theory of Relativity Lot of three early works on the theory of relativity with two b

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1922//1925, The Theory of Relativity Lot of three early works on the theory of relativity with two b
1922//1925, The Theory of Relativity Lot of three early works on the theory of relativity with two being descriptive rather than mathematical and written in German. These include "Der Aether Und Die Relativitaetstheorie" by Dr. L. Graetz (1923 first printing, softbound, 80pp.) and "Der Physikalische Gehalt Der Speziellen Relativitaetstheorie" by Dr. D. Gawronsky (1925, softbound, 64pp.). The third book is technical and in Engish. It is "The Foundations of Einstein's Theory of Gravitation" by Erwin Freundlich with the preface by Einstein himself. Translated from the German by Brose. (1922, softbound, 60pp.). Early works on relativity are quite scarce. The condition is Fine considering their age and how they were made.