An uncertain future : Australian birdlife in danger / Geoffrey Maslen ; photography by Dr Rohan Clarke.
Author: Maslen, Geoffrey, 1936-, author.; Clarke, Rohan, photographer.
Enjoying ornithology : a celebration of fifty years of the British Trust for Ornithology, 1933-1983 / edited and compiled by Ronald Hickling.
Author: Hickling, Ronald Arthur Overton, 1912-