Washington, D.C., 1923. “Post Office clerks, calisthenics.” National Photo Company Collection glass negative.
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![Washington, D.C., 1923. “Post Office clerks, calisthenics.” National Photo Company Collection glass negative.
[via Shorpy]](http://26.media.tumblr.com/tumblr_ku3i1emaeh1qztwz7o1_500.jpg "Washington, D.C., 1923. “Post Office clerks, calisthenics.” National Photo Company Collection glass negative.
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