1. Anon. Proceedings of the conference on alternate nitrogen sources for ruminants. Nov.9–111977, Atlanta, Georgia. pp.90Nat. Fertilizer Dev. Center. Bull. 4–130
2. Anon. 1981a.Food, fuel and fertilizer from organic wastes, 154Washington, DC: National Academy Press.
3. Anon. 1981b.Livestock waste: a renewable resource. Proceedings of the International Symposium of the American Society of Agricultural Engineers, 2–81. St. Joseph, Michigan, USA: ASAE.