Fotografie není součástí této kopie — POLAND - CIRCA 1959: stamp printed by Poland, shows Dmitri I. Mendeleev, circa 1959. POLAND - CIRCA 1959: stamp printed by Poland, shows Dmitri I. Mendeleev, circa 1959
Fotografie není součástí této kopie — POLAND - CIRCA 1959: stamp printed by Poland, shows Dmitri I. Mendeleev, circa 1959. POLAND - CIRCA 1959: stamp printed by Poland, shows Dmitri I. Mendeleev, circa 1959