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Les institutions d'expérementation agricoledans les pays chauds
1934
Persistent link: https://www.econbiz.de/10003158240
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L' enseignement agricole dans le monde : agricultural education in the world
1935
Persistent link: https://www.econbiz.de/10003113362
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Amérique du nord
1938
Persistent link: https://www.econbiz.de/10003113364
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Europe
1935
Persistent link: https://www.econbiz.de/10003122810
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Europe
1936
Persistent link: https://www.econbiz.de/10003122828
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Amérique centrale et du sud, Asie, Afrique et Océanie
1940
Persistent link: https://www.econbiz.de/10003122867