Comprises: Various ornithological letters, 1959-1969, including letters from David Lack, Jan-Feb 1959 International Committee for Bird Preservation (ICBP) papers and correspondence, [c.1951]-1962, including from Phyllis Barclay-Smith relating to the ICBP and the International Union for Conservation of Nature (IUCN), [c.1957]-1958, and a League of Nations publication entitled 'Pollution…