The northern sea route

Krypton, Constantine. The northern sea route: its place in Russian economic history before 1917 / Constantine Krypton ; foreword by Michael M. Karpovich . - New York : Research Program on the U.S.S.R., 1953 . - ix, 194 p. map. 21 cm. - Studies on the U.S.S.R. no. 2 .
К.: Бібліогр. : c. 157-189, Index