File:Jim Propp.jpgDescriptionJim Propp.jpg Italiano: Foto di Jim Propp Date 1989 Source https://opc.mfo.de/detail?photo_id=5784 Author creator QS:P170,Q16198978 Permission
File:James Propp 2012.jpgDescriptionJames Propp 2012.jpg English: American mathematician James Propp at Berkeley, California Date 2012 Source Email correspondence; see also https://opc
File:James Propp 1988 (re-scanned).jpgDescriptionJames Propp 1988 (re-scanned).jpg English: One of photos of American mathematician James Propp at Berkeley, California Date 1988 Source Scanned