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Poster promoting the <a href="https://en.wikipedia.org/wiki/Philadelphia_Zoo" class="extiw" title="w:Philadelphia Zoo">zoo</a> as a place to visit, showing a <a href="https://en.wikipedia.org/wiki/hippopotamus" class="extiw" title="w:hippopotamus">hippopotamus</a>.</div>
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Unknown artist<span style="display: none;">Unknown artist</span></div>
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