Blair House, in Washington DC, pictured between 1918 and 1920
Unknown author<span style="display: none;">Unknown author</span>
<p><b>Original publication</b>: unknown<br></p>
<b>Immediate source</b>: <a rel="nofollow" class="external free" href="https://www.loc.gov/pictures/item/npc2007000181/">https://www.loc.gov/pictures/item/npc2007000181/</a>