New Naturalists. The Natural History of Orkney [and:] British Warblers. London: Collins, 1985. 2 volumes, 8vo, original green cloth, dust jackets each with Duraseal protector, Orkney with contemporary ownership inscription ('M. Mitchell, February 1986') to front free endpaper, Warblers jacket spine slightly faded and Duraseal protector a little cockled on front cover (qty: 2) Bernhard & Loe NN70A & 71A. First edition, first state of each work, numbers 70 and 71 and the two rarest titles in the New Naturalist series; 725 copies of each were printed.