Comprises: Papers and correspondence with T. & A.D. Poyser, publishers, [c.1975]-1982 Correspondence, including with David and Elizabeth Lack, James Monk, Salim Ali, Bert Axell, Ernst Schüz, [c.1969]-1980 Various papers on the Delaware Valley Ornithological Club and H.G. Alexander's bird writings, [c.1970s]