Two duckpin bowlers, 24 February 1936, by Harris &amp; Ewing, photographers, from glass negative at the U.S. Library of Congress
Harris &amp; Ewing, photographers, rights expired per Library of Congress
<ul><li>Source at U.S. Library of Congress: <a rel="nofollow" class="external free" href="https://www.loc.gov/resource/hec.40140/">https://www.loc.gov/resource/hec.40140/</a></li>
<li>Archive of source: <a rel="nofollow" class="external free" href="https://web.archive.org/web/20210430201822/https://www.loc.gov/resource/hec.40140/">https://web.archive.org/web/20210430201822/https://www.loc.gov/resource/hec.40140/</a></li>
<li>Library of Congress re free use: <a rel="nofollow" class="external free" href="https://www.loc.gov/rr/print/res/140_harr.html">https://www.loc.gov/rr/print/res/140_harr.html</a></li>
<li>Archive: <a rel="nofollow" class="external free" href="https://web.archive.org/web/20210323135515/https://www.loc.gov/rr/print/res/140_harr.html">https://web.archive.org/web/20210323135515/https://www.loc.gov/rr/print/res/140_harr.html</a></li></ul>