<a href="https://en.wikipedia.org/wiki/Duster_Mails" class="extiw" title="en:Duster Mails">Duster Mails</a> from the George Grantham Bain Collection of the Library of Congress Prints and Photographs Division
Bain News Service
1916
<a rel="nofollow" class="external free" href="http://hdl.loc.gov/loc.pnp/ggbain.22441">http://hdl.loc.gov/loc.pnp/ggbain.22441</a>