1. CropReportingBoard(1981 ) Economics, Statistics and Cooperative Services, United States Department of Agriculture. Crop Production: 1980 Annual Summary CrPr 2-1 (81), January 14, 1981.
2. CropReportingBoard(1981 ) Economics, Statistics and Cooperative Services, United States Department of Agriculture. Field Crops: Production, Disposition, Value-1979-1980 CrPr 1 (81), April 1981.
3. CropReportingBoard(1982 ) Statistical Reporting Service, United States Department of Agriculture. Crop Production, 1981. Annual Summary. CrPr 2-1 (82), January 15, 1982.
4. Foliar Responses that may Determine Plant Injury by Simulated Acid Rain
5. EFFECTS OF ACIDIC SOLUTIONS ON SEXUAL REPRODUCTION OF PTERIDIUM AQUILINUM