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Conferences
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14 March 1936
14 March 1936
19 January 1936
19 January 1936
20 January 1936
20 January 1936
22 January 1936
22 January 1936
23 January 1936 (1)
23 January 1936 (1)
25 January 1936
25 January 1936
26 January 1936 (1)
26 January 1936 (1)
2nd International Congress of Cooperatibe Economy - Lourdes, October 1948
2nd International Congress of Cooperatibe Economy - Lourdes, October 1948
5ème Conference Internationale des Engrais Chimiques et Produits Chimiques utiles a l'Agriculture - Zürich, Aout 1949
5ème Conference Internationale des Engrais Chimiques et Produits Chimiques utiles a l'Agriculture - Zürich, Aout 1949
5th International Conference of Directors of Mine-Safety Research - September 1948
5th International Conference of Directors of Mine-Safety Research - September 1948