Prof. M. Pupin (LOC)
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Photo credit: © PF-(bygone1) / Alamy / Afripics
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Keywords: archive, columbia, congress, dc:identifier=, dc:identifier=httphdllocgovlocpnpggbain12229, great, greatmustachesoftheloc, historic, history, idvorski, library, libraryofcongress, loc, mihaljo, mihaljoidvorskipupin, mustaches, photograph, professor, pupin, serbian, vintage, xmlns:dc=, xmlns:dc=httppurlorgdcelements11