Eleventh General Assembly [of the] International Union for Conservation of Nature and Natural Resources :
Eleventh General Assembly [of the] International Union for Conservation of Nature and Natural Resources : Banff, Alberta, Canada, 11-16 September 1972 : proceedings.
- Morges, Switzerland : IUCN, 1972.
- 331 p.
- IUCN publications new series. v. n. 40 E .
Conservação da natureza--Congressos.
333.72
333.72 / I61
Conservação da natureza--Congressos.
333.72
333.72 / I61