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2. Solar-assisted combination drying: an economic evaluation;Heid;Agricultural Economic Report, Economics, Statistics and Co-operative Services, US Department of Agricultural, No. AER-453,1980
3. Cost/performance goals for agricultural solar collectors;Hellickson;American Society of Agricultural Engineers Paper No. 79-4054,1979
4. Sizing solar collector on the basis of daily efficiency;Kuan-Chong;American Society of Agricultural Engineers Paper No. 80-3543,1980
5. Economic feasibility of high temperature solar grain drying;Loever;American Society of Agricultural Engineers Paper No. 80-3021,1980