Magnolia and Kirtland's Warblers from <i>Bird-Lore, Vol. VI, No. 6.</i>
<bdi><a href="https://en.wikipedia.org/wiki/en:Robert_Bruce_Horsfall" class="extiw" title="w:en:Robert Bruce Horsfall"><span title="American painter">Robert Bruce Horsfall</span></a>
</bdi>
1904-11
<a rel="nofollow" class="external text" href="https://archive.org/details/birdlore61904nati">The Internet Archive</a>