1. Conservation ofNatural Areas and ofthe Genetic Material They Contain: 64 (1973).
2. Task Force on: Criteria and Guidelines for the Choice and Establishment of Biosphere Reserves 1974
3. IUCN OCCASIONAL PAPER 1973 7 A system for defining and classifying natural regions for purposes of conservation
4. IUCN OCCASIONAL PAPER 1974 9
5. IUCN OCCASIONAL PAPER 1975 18 Classification of the Biogeographical Provinces of the World