Martin, John H. 1893-
Principles of field crop production / John H. Martin [and] Warren H. Leonard. - New York : Macmillan Co., c1949. - ix, 1176 p. : illus., maps ; 22 cm.
"References" at end of each chapter.
agr49000449
Field crops.--United States.
SB187.U6 / M3
631.5 / MAP
Principles of field crop production / John H. Martin [and] Warren H. Leonard. - New York : Macmillan Co., c1949. - ix, 1176 p. : illus., maps ; 22 cm.
"References" at end of each chapter.
agr49000449
Field crops.--United States.
SB187.U6 / M3
631.5 / MAP