Map of the Majdanek concentration camp.
<a href="//commons.wikimedia.org/wiki/User:FDRMRZUSA" class="mw-redirect" title="User:FDRMRZUSA">FDRMRZUSA</a>
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<span class="int-own-work" lang="en">Own work</span>—information probably from <a rel="nofollow" class="external text" href="https://encyclopedia.ushmm.org/content/en/map/majdanek-camp-fall-1943">this USHMM map</a>