Perkings, Dwight H. Agricultural development in China 1368-1968 / Dwight H. Perkings; with the assistance of Yeh-Chien Wang - Chicago : Aldine Pub., 1969 - xv, 395p.; 22 cm. Subjects--Topical Terms: Agriculture--China Dewey Class. No.: 630.951 / PEA 1969