44. Valdez, U., S. Robertson, B. Robertson, and K. L. Bildstein. 2000. Nestbox use by American Kestrels (Falco sparverius) and European Starlings (Sturnus vulgaris) in eastern Pennsylvania. Pennsylvania Birds 14:150-153.
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44. Valdez, U., S. Robertson, B. Robertson, and K. L. Bildstein. 2000. Nestbox use by American Kestrels (Falco sparverius) and European Starlings (Sturnus vulgaris) in eastern Pennsylvania. Pennsylvania Birds 14:150-153.
Download