Great Soviet encyclopedia,Vol.29
Prokhorov,A M.
Great Soviet encyclopedia,Vol.29 - 3rd ed. - Newyork Macmillan 1982 - 779p.
037 / PRO/G.29
Great Soviet encyclopedia,Vol.29 - 3rd ed. - Newyork Macmillan 1982 - 779p.
037 / PRO/G.29