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2
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Environmental education about the rain forest / by Klaus Berkmüller.
- IUCN. Forest conservation programme,
- 1992.
- Gland [etc.] :
-
World conservation strategy : a programme for youth : manual for youth environmental projects / prep. by Klaus Berkmuller and Martha C. Monroe.
- IUCN [etc.],
- 1986.
- Gland [etc.] :