Clark, Colin, 1905- The economics of subsistence agriculture / by Colin Clark and Margaret Haswell. - 2nd ed. - London, Melbourne [etc.] New York, Macmillan; St. Martin's P., 1966 - viii, 216 p.: 42 tables, 15 diagrs.; 23 cm. Bibliography: p.199-207. and index Subjects--Topical Terms: Agriculture--Economic aspects. Dewey Class. No.: 338.1 / CLE 1954