na INLIS000000000006323 20221020022514 0010-1022000011 ta 221020 0 eng 0-471-93417-8 631:303.02 631:303.02 JOH p Planned Change in Farming Systems Progress in On Farm Research England : JOHN, Wiley & Sons, 1991 347p. : ilus ; 25,5 cm on farm research farming systems JOHN, Wiley & Sons Perpustakaan BPTP Jatim