Proceedings and papers of the IUCN 10th Technical Meeting (Lucerne, June 1966). Part 1. Ecological impact of recreation and tourism upon temperate environment. Section 2B
(1967). Proceedings and papers of the IUCN 10th Technical Meeting (Lucerne, June 1966). Part 1. Ecological impact of recreation and tourism upon temperate environment. Section 2B. IUCN publications New series, 7. IUCN: [s.l.].
Deel van: IUCN publications New series. IUCN. ISSN 0253-3723, meer
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