XIth International Botanical Congress - Franklinia (Franklinia alatamaha) - 6-cent 1969 issue U.S. stamp.
Bureau of Engraving and Printing. Designed by Stanley W. Galli.
U.S. Postal Service; National Postal Museum: <a rel="nofollow" class="external text" href="http://arago.si.edu/category_2034291.html">Botanical Congress Issue</a>