Books — Global Red Lists & Red Data Books
List of Rare Birds, Including Those Thought to be So but of Which Detailed Information is Still Lacking
This document is available in English and French.
Compiled by the International Council for Bird Preservation in collaboration with the IUCN Survival Service Commission. January 1964. List of Rare Birds, Including Those Thought to be So but of Which Detailed Information is Still Lacking. Published as a Special Supplement to IUCN Bulletin (new series) No. 10.