Agricultural economics /
O'Brien, G
Agricultural economics / G O'Brien - Bogra : Economic association, c1966. - 154p. ; 21 cm.
Agricultural economics
HD1411 / .O3 1966
338.1 / O13a
Agricultural economics / G O'Brien - Bogra : Economic association, c1966. - 154p. ; 21 cm.
Agricultural economics
HD1411 / .O3 1966
338.1 / O13a