Soil Science by R. G. McLaren and K. C. Cameron.
No-tillage seeding by C. J. Baker, K. E. Saxton, and W. R. Ritchie.
Herbicide resistant crops and pastures in Australian farming systems edited by G. D. McLean and G. Evans.
PDF file of entire paper: medium quality (331K); (scanned from paper original: notes about this process)