search materials(including e-books and e-journals) held by Hokkaido university.
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Search keyword：(Subject: #Olduvai Gorge)
Excavations in beds III, IV, and the Masek beds, 1968-1971 / M.D. Leakey with D.A. Roe ; with contributions by P. Callow ... [et al.]
Cambridge [England] : Cambridge University Press , 1994. - (Olduvai Gorge ; v. 5)
Mary Leakey : archaeologist who really dug her work / written and illustrated by Mike Venezia
New York : Children's Press , 2009. - (Getting to know the world's greatest inventors and scientists)