Plik:Alfred Pearson.pngDescriptionAlfred Pearson.png Polski: Alfred Pearson Date 1925 Source Narodowe Archiwum Cyfrowe, Sygnatura: 1-D-1488 Author Unknown authorUnknown author
Plik:Pearson.pngDescriptionPearson.png English: Alfred J. Pearson Source http://poland.usembassy.gov/emb_previous.html Author U.S. Department of State