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Author/Creator
- American Society of Agronomy1
- Benzaria, Solange1
- Bourne, Charles P.1
- C.A.B. International, compiler1
- Crop Science Society of America1
- Crop Science Society of America. Agronomic Education Division1
- France. Commissariat à l'énergie atomique. Dép. de biologie. Groupe des applications agronomiques1
- Frauendorfer, Sigmund von1
- Hood, Martha W.1
- Institut Penyelidikan dan Kemajuan Pertanian Malaysia1
- Institut Pertanian Bogor. Fakultas Pertanian1
- Jāmiʻat al-Qāhirah. Kullīyat al-Zirāʻah1
- Landbouwhogeschool Wageningen1
- North Rhine-Westphalia (Germany). Landesausschuss für Landwirtschaftliche Forschung, Erziehung und Wirtschaftsberatung1
- Soil Science Society of America1
- Tōkyō Daigaku. Nōgakubu1
- United States. Department of Agriculture. States Relations Service1
- United States. Office of Experiment Stations1