Kovalchenko, I..
Methods of studying the process of the formation of the agricultural commodities market in Russia in the 18th-20th centuries /
I. Kovalchenko, L. Milov 
. - [Leningrad] : [s. n.],  1970 
. - 10 p.  tab.  21 cm. 
<br/><br/> В надзаг. : V International Congress of economic history, Leningrad, 10-14 August, 1970.