Agricultural and resource policy: principles and practice by David Godden.
Peter Kettle
CSIRO handbook of Australian weeds by M. Lazarides, K. Cowley, and P. Hohnen.
Ian Popay
Principles and practice of managing soilborne plant pathogens, edited by Robert Hall.
G. C. M. Latch
PDF file of entire paper: medium quality (264K); (scanned from paper original: notes about this process)