4 links
Catalog of the Scientific Community: Mersenne, Marin
galileo.rice.edu
Basic biographical facts compiled as part of the Galileo Project.
Catholic Encyclopedia: Marin Mersenne
newadvent.org
Article by C.A. Dubray reviewing the intellectual career of this learned Minim friar.
Horror Vacui? Marin Mersenne
galileo.imss.firenze.it
Brief article focusing on Mersenne's role in the early scientific debate on this problem of the vacuum.