The experience of calculating the national income of 50 lips of European Russia in 1900-1913 In Russian (ask us if in doubt)/Opyt ischisleniya narodnogo dokhoda 50 gub. Evropeyskoy Rossii v 1900-1913 gg. Edited by S. N. Prokopovich. Soviet of All-Russian Cooperative Congresses. Moscow, 1918, 86s. SKUalbb7b25117bf770709.