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Author
by Richard A. Weinstein
by Roger T. Saucier
by Inc Cultural Resource Management
by Pennsylvania State College. Agricultural Experiment Station
by Pennsylvania. State Soil and Water Conservation Commission
by North Dakota Agricultural Experiment Station (Fargo)
by Alabama. Department of Agriculture and Industries
by Southeastern Connecticut Regional Planning Agency
by University of Georgia. College of Agriculture. Experiment Stations
by University of Wisconsin--Madison. Agricultural Experiment Station
by Duane A. Lammers
by James Thorp
by R.. Ulrich
by Dupree Sanders
by Texas Agricultural Experiment Station
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