Great Soviet encyclopedia,Vol.5
Prokhorov,A M.
Great Soviet encyclopedia,Vol.5 - 3rd ed. - Newyork Macmillan 1974 - 754p.
037 / PRO/G.5
Great Soviet encyclopedia,Vol.5 - 3rd ed. - Newyork Macmillan 1974 - 754p.
037 / PRO/G.5