File:The Soviet Union 1949 CPA 1435 stamp (Birth centenary of l. P. Pavlov, Russian physiologist (1849-1936). Painting after Mikhail Nesterov).jpg
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The_Soviet_Union_1949_CPA_1435_stamp_(Birth_centenary_of_l._P._Pavlov,_Russian_physiologist_(1849-1936)._Painting_after_Mikhail_Nesterov).jpg (448 × 316 pixels, file size: 28 KB, MIME type: image/jpeg)