- International Conference on Plant Growth Substances (4)
- American Chemical Society. Division of Agricultural and Food Chemistry (1)
- Asian and Pacific Council. Food & Fertilizer Technology Center (1)
- Boyce Thompson Institute for Plant Research (1)
- Brooklyn Botanic Garden (1)
- International Plant Growth Substances Association (1)
- Karssen, C. M. (Cees M.) (1)
- Loon, L. C. van (Leendert C.) (1)
- Macgregor, Peter (1)
- NATO Advanced Study Institute on Plant Regulation and World Agriculture (1)
- New York Botanical Garden (1)
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- Ory, Robert L., 1925- (1)
- Pilet, Paul-Emile, 1927- (1)
- Rittig, Falk R., 1939- (1)
- Scott, Tom K. (1)
- Vreugdenhil, D. (Dick) (1)
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