I note you have already had a question on blackberry infestations. I have a
20 acres of very steep country that is almost totally covered in blackberries
and would like to know more about organic weed control - can you suggest
some good references.
Healy, A. J. Mason, R New Zealand Weed and Pest Control Society, Mechanical weed control - keys to getting good yields while reducing or eliminating the use of herbicides,
French, Jacqueline, Jorgenson, Greg, Organic control of common weeds, 1989
Readman, Jo, Weeds - how to control and love them, 1991