Yang, W. Y. Methods of farm management investigations for improving farm productivity / W. Y. Yang - Rome : Food and Agriculture Organization (FAO) , 1965 - xiii, 258p. : ill. ; 23 cm. - FAO agricultural development paper No. 80 FAO agriculture series No. 11 . Includes bibliographies. ISBN: 9251010161 Subjects--Topical Terms: Farm management--Research Gov. Doc. Class. No.: UN FAO AS-11 ADP-80