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The Mexican cultural mission programme / by Lloyd H. Hughes.
- UNESCO,
- 1950.
- Paris :
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International technical conference on the protection of nature : Lake Success, 22-29-VIII-1949 : proceedings and papers = Conférence technique internationale pour la protection de la nature : Lake Success, 22-29-VIII-1949 : procès-verbaux et rapports / ed. by the secretariat of the International union for the protection of nature.
- UNESCO,
- 1950.
- Paris [etc.] :