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- Conference on use and conservation of the biosphers (1968 : Paris)
- Confrence on aerial surveys n dintergrated stuidies (Toulouse)
- Eckardt F E Ed
- Eckardt F.E. Ed
- International conference on functioning of terrestrial ecosystems at the primary productin level (1965 : Openhagen)
- Seminar on Use and Conservation of the Biosphere (Paris (1968))
- Symposium on Functioning of Terrestrial Ecosystems at the Primary Production Level (Copenhagen, 1965)
- Symposium on functioning of terrestrial ecosystems of the primary production level (1965 : Copenhagen)
- Symposium on soils and tropical weathering (1969 : Bandung)
- Szabolcs I.
- Unesco
- UNESCO
- Unesco Symposium On Agroclimatological Methods, 1966 (United Kingdom)
- Unesco Symposium on Agroclimatological Methods (University of Reading) (1966)
- UNITED NATIONS EDUCATIONAL, SCIENTIFIC AND CULTURAL ORGANIZATION
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- Natural resources research
- Natural resources research,1
- Natural resources research; 10
- natural resources research; 16
- Natural resources research; 6
- Natural resources research/Recherches sur les ressources naturelles; 7
- Natural Resources Research Series
- Natural Resources Research Series; 10
- Natural Resources Research Series; 7
- Natural resources research series no. XV
- Natural resources research XVIII
- Unesco's Natural Resources Research. 11
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