Alstrom, Per books & textbook
Pipits and Wagtails.
Princeton University Press /2003-05-04 Hardcover / 496 Pages
isbn-10: 0691088349 / isbn-13: 9780691088341
Pipits and Wagtails of Europe, Asia and North America: Identification and Systematics
Christopher Helm /2003T Hardcover / 496 Pages
isbn-10: 0713658347 / isbn-13: 9780713658347
Species Limits & Systematics in Some Passerine Birds (Comprehensive Summaries of Uppsala Dissertations from the Faculty Science and Technology, 726)
Uppsala Universitet /2002-06-28 Paperback / 30 Pages
isbn-10: 9155453414 / isbn-13: 9789155453411
