00645cam a2200205 7i4500 0000002577 20150512090000.0 20000806000000.0 060626 0521202698 S439 .G788 1974 Grigg The agricultural systems of the world : an evolutionary approach D. B. Grigg. London: Cambridge University Press, 1974. ix, 358p.: ill. Cambridge geographical studies; 5 Bibliography: p. 308-343 Agricultural geography Agriculture -- History BP00002838 Book Open Shelf Dengkil Library