TY - BOOK AU - Sprague,G.F. TI - Corn and corn improvement T2 - Agronomy ; no. 18 SN - 0891180435 AV - SB191.M2 S6254 1977 U1 - 633/.15/3 PY - 1977/// CY - Madison, Wis. PB - American Society of Agronomy KW - Corn KW - Breeding N1 - Includes bibliographies and index ER -