George V. Lantzeff, Siberia in the Seventeenth Century. A Study of the Colonial Administration. University of California Publications in History. Volume XXX. Berkeley, Calif.: University of California Press, 1943. 235 pp. - Raymond H. Fisher, The Russian Fur Trade, 1550–1700. University of California Publications in History. Volume XXXI. Berkeley Calif.: University of California Press, 1943. 275 pp.