December 16, 1916 - Assistant Secretary Abbot to Secretary Walcott on Goddard's Proposal
<bdi><a href="https://en.wikipedia.org/wiki/en:Charles_Greeley_Abbot" class="extiw" title="w:en:Charles Greeley Abbot"><span title="American astrophysicist and the 5th Secretary of the Smithsonian">Charles Greeley Abbot</span></a>
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2012-06-04
smithsonian archives <a rel="nofollow" class="external free" href="http://siarchives.si.edu/history/exhibits/documents/goddarddec161916.htm">http://siarchives.si.edu/history/exhibits/documents/goddarddec161916.htm</a>