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21st International Horticultural 29 August-4 September Acta horticulturea Agricultural Engineers Alexandria American Society Beltsville Cal1 call number Composted Congress on Nutrient Crop Science Society DNAL 80 DNAL SB1.H6 Energy in Protected Federal Republic fiche greenhouse tomatoes growing medium Hague Hamburg HJHSA Horticultural Science HortScience hydroponic culture Hydroponics/nutrient film technique Includes 12 references Includes references Interlibrary Loan International Horticultural Congress International Plant Propagators International Society J.AHORA Journal of plant June land-grant university lettuce Library University ln hydroponic Madison Marcel Dekker microfiche NAL Call National Agricultural Library NFT nutrient film nitrate nitrogen Nutrient Film Technique nutrient solution Paper presented Pennsylvania Flower Growers plant nutrition Plant Propagators production Protected Cultivation Quick bibliography series Republic of Germany Research Sept Society for Horticultural Society of Agricultural Society of America soybeans spray chrysanthemums Symposium on Substrates Technique and Substrates tomato tomato plants tomatoes grown University Library USDA Wageningen Weed Science York