search materials(including e-books and e-journals) held by Hokkaido university.
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Search keyword：(Author: #Hartog Leo de)
Genghis Khan : conqueror of the world / Leo de Hartog
: pbk. - London : I.B. Tauris , 1999
Russia and the Mongol yoke : the history of the Russian principalities and the Golden Horde, 1221-1502 / Leo de Hartog
London : British Academic Press : I.B. Tauris , 1996