Russia 3189-3191A blocks/4

Russia 3189-3191A blocks of 4, MNH, $12.00. Michel 3201-3203, 3291. Soviet Scientists, 1966. A.E. Fersman, 1883-1945, mineralogist; D.K. Zabolotny, 1866-1929, microbiologist; M.A. Shatelen, 1866-1957, physicist; Otto Y. Schmidt, 1891-1956, scientist and Arctic explorer.