The Farm as Natural Habitat 213Leopold, A. 1966. A Sand County Almanac with Essays on Conservation from Round River. Ballantine
Books, New York
Leopold, A. 1991. The Farmer as a Conservationist. Pp255–265 in The River of the Mother of God and
Other Essays by Aldo Leopold, edited by B. Callicott and S. Flader. University of Wisconsin Press,
Madison
Minnesota Pollution Control Agency. 1994. Executive Summary: Minnesota River Assessment Project
Report. Minnesota Pollution Control Agency, St. Paul, MN
Paine, L. 1996. Pasture Songbirds. Pasture Talk, May, 8–9
Rayburn, E. B. 1993. Potential Ecological and Environmental Effects of Pasture and BGH Technol-
ogy. Pp247–276 in The Dairy Debate: Consequences of Bovine Growth Hormone and Rotational
Grazing Technologies, edited by W. C. Liebhardt. University of California, Davis
Savory, A. 1998. Holistic Resource Management. Island Press, Washington DC
Soule, J. D. and J. K. Piper. 1991. Farming in Nature’s Image: An Ecological Approach to Agriculture.
Island Press, Washington DC
United States Department of Agriculture (USDA). 1997. Census of Agriculture. Vol. 1. United States
Department of Agriculture, National Agricultural Statistics Service, Washington DC