Raphael Pumpelly: verschil tussen versies

* [https://web.archive.org/web/20100730125334/http://www.mnsu.edu/emuseum/information/biography/pqrst/pumpelly_ralph.html Raphael Pumpelly biography]

* [https://web.archive.org/web/20120220074134/http://www.redwoodlibrary.org/notables/pumpelly.htm Newport Notables - Raphael Pumpelly]