Rubakin N. Convolute from 4 books (first editions). In Russian /Rubakin N. Konvolyut iz 4 knig (pervye izdaniya). 1. What are comets (1912). 2. How, when, and why humans appeared on Earth (1918). 3. Among Mysteries and Miracles (1919). 4. Stories about the exploits of the human mind (1919) 1912-1920. 68 and 72 and 156 and 88 p.Please contact us for details on condition of available copies of the book. SKUalb7620c5627a6a6d20