Agricultural plants / R.H.M. Langer, G.D. Hill ; ill. by Karen Mason. Langer, R. H. M. (Reinhart Hugo Michael), 1921- Hill, G. D., joint author. Crops. SB91 .L26 1982 631 19 L 276 a Includes bibliographical references and indexes. Cambridge [Eng.] ; New York : Cambridge University Press, 1982. 1982. 1982 Text vii, 344 p. : eng