John V. Moore, Niels Krabbe, Olaf Jahn, M. Lysinger, P. Coopmans, P. Mena V., A. Spencer, R. S. Ridgely, J. Nilsson, D. F. Lane, N. Athanas, L. Navarrete, John V. Moore, John
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About the Cornell Guide to Bird Sounds – Macaulay Library
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Bird sounds and bird calls in USA & Canada (602 species)