na INLIS000000000003735 20240119101656 0010-0621000021 240119 f 0 eng The economics of subsistence agriculture / Colin Clark: Margaret Haswell CLARK, Colin 2nd ed. New York : ST Martin's Press MacMillan, 1966 viii, 216 p. : ill. ; 22 cm. 631.16 CLA e 631.16 AGRICULTURAL ECONOMICS HASWELL, Margaret 21/KA/2021