Yudin, P. F. The prime source of the development of Soviet society : concerning the complete conformity between the productive forces and the relations of production in the U.S.S.R. Moscow : Foreign Languages Publishing House. 1950, [55] p. Notes : "Translation of an essay published in the symposium Soviet Socialist Society prepared by the Institute of Philosophy of the Academy of Sciences of the U.S.S.R. and published by the Gospolitizdat, Moscow 1949"--Verso of t.p.