White wagtail : Motacilla alba. Black-backed wagtail : Motacilla lugens /
| Main Author: | |
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| Corporate Authors: | , |
| Other Authors: | , |
| Format: | Book |
| Language: | English |
| Published: |
Washington, D.C. : Philadelphia, PA :
American Ornithologists' Union ; The Academy of Natural Sciences,
1996
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| Series: | Birds of North America ;
v. 6, no. 236-237 |
| Subjects: |