Intergovernmental Conference of Experts on the ScientificBasis for Rational Use and Conservation of the Resources of he Biosphere (proceedings)
Bok
·
Engelsk
·1970
· Vis mer
International Union for Conservation of Nature and Natural Resources. Natural aquatic resources (7th: 1958 Athen, Hellas)
Bok
·
Engelsk
·1959
· Vis mer