1. Classification of Wetlands and Deepwater Habitats of the United States;Cowardin,1979
2. A Focus on Peatlands and Peat Mosses;Crum,1988
3. Wetlands Losses in the United States, 1780s to 1980s;Dahl,1990
4. Development of soil mottling;Diers;Soil Survey Horizons,1984
5. Chemical and microbiological properties of anaerobic soils and sediments;Gambrell,1978