Gekkel E. The worlds mysteries. In Russian /Gekkel E. Mirovye zagadki. Popular Essays on Monistic Philosophy. Translated from German by G.A. Kotlyar, edited by M.M. Filippov. Moscow, edited by D.P. Efimov, 1902. VI, 356 p. We have thousands of titles and often several copies of each title may be available. Please feel free to contact us for a detailed description of the copies available. SKUalb85950f2b8c2c817e.