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Year	Title
2014	Red-breasted Sapsucker (Sphyrapicus ruber).  Birds of North America Online. Cornell Lab of Ornithology.
2014	Red-naped Sapsucker (Sphyrapicus nuchalis).  Birds of North America Online. Cornell Lab of Ornithology.
2002	Red-breasted Sapsucker (Sphyrapicus ruber) and Red-naped Sapsucker (Sphyrapicus nuchalis).  The Birds of North America. Philadelphia, PA: The Birds of North America, Inc..
2002	Yellow-bellied Sapsucker (Sphyrapicus varius).  The Birds of North America. Philadelphia, PA: The Birds of North America, Inc..