The urge to the sea; the course of Russian history. The role of rivers, portages, ostrogs, monasteries, and furs. Kerner, Robert Joseph, 1887-1956. DK43 .K47 947 KEU Includes bibliographical references and index. Berkeley and Los Angeles, University of California press [c1942] [c1942] 1942 Text 212 p. : eng Publications of the Northeastern Asia seminar of the University of California Soviet Union History.