Russian physicist (1857-1935) who pioneered the study of rocketry and cosmonautics and whose discoveries were of crucial importance in the development of manned space travel. ALS in Russian, four pages, 4.75 x 7.5, 1927. An untranslated handwritten letter from Konstantin Tsiolkovsky. In fine condition, with somewhat rough edges. Accompanied by a Russian-language hardcover 1934 edition of 'K. E. Tsiolkovsky, Book I, All-Metal Airship.'
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