Gyrfalcons and Ptarmigan in a Changing World Richard T. Watson, Tom J. Cade, Mark Fuller, Grainger Hunt, and Eugene Potapov Boise, Idaho, U.S.A The Peregrine Fund 2 volumes, 372 pp., 400 pp. ISBN 9781461129073, 97814699 43305. Paperback: maps, photos, figures, tables. Price $37 each volume or free online.
Journal of Raptor Research（2013）
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ptarmigan,paperback,maps,peregrine fund,changing
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