338.1
G857A
           Grigg, D B
               The Agricultural systems of the world an evolutionary approach \ D B Grigg - New York : Cambridge University Press, 1974.
               ix, 358p. - Cambridge geographical studies/ed. by B.H. Farmer et.al; 5 .
                ISBN: 0-521-20269-8

90347
                Subjects: Agricultural systems; Agricultural geography; Agricultural resources.