International congress: birds, butterflies and climate in our natural environments
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SCIENCES. 1) Dr Camille WAGNER-ROLLINGER: Les biotopes de nos papillons diurnes, Imprimerie P. Worré-Mertens, 1980. Autograph letter from the author.
2) A. GLODEN: Les précipitations au Grand-Duché de Luxembourg, Bruxelles, 1937.
3) Compte-Rendu du Congrès International pour l'étude et la protection des oiseaux, 1925, Imprimerie P. Worré-Mertens
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