@book{ BA46826228, author = "Clark, William S. and Wheeler, Brian K. and National Audubon Society and National Wildlife Federation", title = "A field guide to hawks, North America", publisher = "Houghton Mifflin", year = "1987", series = "The Peterson field guide series", number = "35", URL = "https://ci.nii.ac.jp/ncid/BA46826228" }

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