1. Photographic utilisation standards for three perennial grasses;Anderson;Rangeland Journal,1994
2. Natural Resources Measurements;Avery,1975
3. Measurements for Terrestrial Vegetation;Bonham,1989
4. Ecology-progress in utilization standards for western ranges;Campbell;Journal of Washington Academy of Science,1943
5. A short-cut method for checking degree of forage utilization;Canfield;Journal of Forestry,1944