Bay-breasted and Chestnut-sided Warblers. From <i>Bird-Lore, Vol. VI, No. 5.</i>
<bdi><a href="https://en.wikipedia.org/wiki/en:William_Dutcher" class="extiw" title="w:en:William Dutcher"><span title="Ornithologist and New York insurance businessman (1846-1920)">William Dutcher</span></a>
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