Rice University
Galileo Project: Christopher Clavius
This site from The Galileo Project of the Rice University provides a biography of Clavius including an excerpt from his writings. A picture is provided in this article along with links to additional information.
New Advent
Catholic Encyclopedia: Pierre Jean De Smet
Catholic Encyclopedia provides a biography on Pierre-Jean de Smet, discussing his missionary work. Please note that ?The Catholic Encyclopedia? is a historic reference source and should be viewed in the context of resource material dated...