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programme and meeting document
Institut international de la zone aride: résolution
1949
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9
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programme and meeting document
International Institute of the Arid Zone: resolution
1949
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8
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programme and meeting document
Les Sols des régions semi-arides d'Afrique et leur mise en valeur
1950
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13
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0
programme and meeting document
Rapport sur les régions arides et semi-arides de l'Afrique du Nord
1950
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18
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programme and meeting document
Report on the arid and semi-arid regions of North Africa
1950
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16
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programme and meeting document
Soils of the semi-arid areas of Africa and their development
1950
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7
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