Asa Gray (1810-1888)
Engraver: Gustav Kruell (1843–1907)<a rel="nofollow" class="external autonumber" href="http://www.clevelandart.org/explore/artist.asp?artistLetter=K&amp;recNo=155">[1]</a>
1890
This engraving was published in: <cite class="book" style="font-style:normal" id="Reference-Jordan-1910">Jordan, David Starr (1910)      <i> <a rel="nofollow" class="external text" href="https://books.google.com/books?id=Iw0_AAAAIAAJ&amp;pg=PA210">Leading American Men of Science</a></i>, <a href="https://en.wikipedia.org/wiki/en:Category:New_York" class="extiw" title="w:en:Category:New York"><span title="Wikimedia category">Category:New York</span></a>:  H. Holt and Company, pp. p. 210 Retrieved on 16 June 2009. <small></small></cite>