text London Academic Press 1975 eng ix, 261 p.: ill.; 23 cm. ; 23 cm. Incl. Index C.R.W. Spedding FARMING SYSTEMS BIOLOGY 631 631 SPE b 220414 20220414104535 INLIS000000000004319 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)