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1. IYF Lüneburger Heide course 1955-1969 / / International Youth Federation for Environmental Studies and Conservation ; published with support of the International Union for Conservation of Nature and Natural Resources (IUCN).
Auteur:
International Union for Conservation of Nature and Natural Resources (IUCN)
Uitgever:
[S.l.] : : IYF, , 1971.
Jaar:
1971
Type:
miscellanea