Great Soviet encyclopedia,Vol.14
Prokhorov,A M.
Great Soviet encyclopedia,Vol.14 - 3rd ed. - Newyork Macmillan 1977 - 802p.
037 / PRO/G.14
Great Soviet encyclopedia,Vol.14 - 3rd ed. - Newyork Macmillan 1977 - 802p.
037 / PRO/G.14