text Iowa The Iowa State University Press 1970 - eng viii, 349 p. : ill. ; 24 cm. Roger L. Mitchell CROPS GROWTH CULTIVATION 633 633 MIT c - 231116 20231116113852 INLIS000000000003879 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)