Martin, John H. 1893-
Principles of field crop production / John H. Martin, Warren H. Leonard. - 2nd ed. - New York : Macmillan, 1967. - ix,1044 p. : ill.
Field crops--United States.
Principles of field crop production / John H. Martin, Warren H. Leonard. - 2nd ed. - New York : Macmillan, 1967. - ix,1044 p. : ill.
Field crops--United States.