An image of Adolphus Lewis Heermann circa 1850 published in the journal Cassinia volume XI by the Deleware Valley Ornithological Club in 1907, now out of copyright.
Unknown author<span style="display: none;">Unknown author</span>
circa 1850 <div style="display: none;">date QS:P,+1850-00-00T00:00:00Z/9,P1480,Q5727902</div>
Retrieved from a D.V.O.C scan of the article: <a rel="nofollow" class="external free" href="http://www.dvoc.org/CassiniaOnLine/Cassinia11/C11_01_6.pdf">http://www.dvoc.org/CassiniaOnLine/Cassinia11/C11_01_6.pdf</a> ; published in the journal Cassinia volume XI by the Deleware Valley Ornithological Club in 1907, now out of copyright.