<bdi><a href="https://en.wikipedia.org/wiki/en:Karol_D._Witkowski" class="extiw" title="w:en:Karol D. Witkowski"><span title="Polish-American artist">Karl Witkowski</span></a>
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<a rel="nofollow" class="external text" href="https://auctions.freemansauction.com/auction-lot-detail/1533/23">Freeman’s, Philadelphia, 6 December 2015, lot 23</a>