Home › Authors › N. I͡A.(Nikolaĭ I͡Akovlevich) Petrakov 👤 N. I͡A.(Nikolaĭ I͡Akovlevich) Petrakov 1 book Books by N. I͡A.(Nikolaĭ I͡Akovlevich) Petrakov Obshchestvenno neobkhodimye za Obshchestvenno neobkhodimye zatraty truda i tseny 1973