Stock Photo - Ivan Pavlov (1849-1936), Russian physiologist, psychologist, physician, Nobel Prize Winner in Physiology or Medicine (1904), postage stamp, Russia, USSR, 1991.

Stock Photo: Ivan Pavlov (1849-1936), Russian physiologist, psychologist, physician, Nobel Prize Winner in Physiology or Medicine (1904), postage stamp, Russia, USSR, 1991.

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