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![Plant Growth Substances 1979: Proceedings of the 10th International Conference on Plant Growth Substances, Madison, Wisconsin, July 2226, 1979 [Paperback]](/itemImage/2/7/8/4/2_5320384.jpg "Plant Growth Substances 1979: Proceedings of the 10th International Conference on Plant Growth Substances, Madison, Wisconsin, July 2226, 1979 [Paperback]")