Cornell University Laboratory of Ornithology. Cayuga Lake Basin Phenological Charts, #21-18-mf.47. Division of Rare and Manuscript Collections, Cornell University Library.
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Cornell University Laboratory of Ornithology. Cayuga Lake Basin Phenological Charts, #21-18-mf.47. Division of Rare and Manuscript Collections, Cornell University Library. https://archives.library.cornell.edu/repositories/2/resources/3142 Accessed August 22, 2026.
