na INLIS000000000003715 20240119101904 0010-0621000001 240119 f 0 eng The economics of subsistence agriculture / Colin Clark: Margaret Haswell CLARK, Colin 3rd ed. New York : ST Martin's Press MacMillan, 1967 viii, 245 p. : ill. ; 22 cm. 631.16 CLA e 631.16 AGRICULTURAL ECONOMICS SUBSISTENCE FARMING HASWELL, Margaret 1/KA/2021