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Norris, R.A. Listings

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1 Norris, R.A. Comparative Biosystematics and Life Histories of Nuthatches, Sitta pygmea & Sitta Pusilla
Berkeley, CA University of California Press 1958 No Original Wraps Very Good 
180pp. ills. maps. Univ. of California Publications in Zoology Vol. 56, No. 2. Compares two closely allied but geographically isolated forms (Brown-headed nuthatch and Pygmy nuthatch) thorugh morphological, ecologic and ethologic findings to determine whether they might be regarded as full species or subspecies. Bibliography. 
Price: 22.50 USD
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2 Norris, R.A. Comparative Biosystematics and Life Histories of Nuthatches, Sitta pygmea & Sitta Pusilla
Berkeley, CA University of California Press 1958 No Original Wraps Very Good 
180pp. ills. maps. Univ. of California Publications in Zoology Vol. 56, No. 2. Compares two closely allied but geographically isolated forms (Brown-headed nuthatch and Pygmy nuthatch) thorugh morphological, ecologic and ethologic findings to determine whether they might be regarded as full species or subspecies. Bibliography. Minor ex-library marking, browning on covers. 
Price: 17.50 USD
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