Immaculate Conception

Thanks to Turretinfan for providing the following:

A list of interesting Papal comments on the sinlessness of Mary:
http://turretinfan.blogspot.com/2010/09/how-many-popes-does-it-take-to-deny.html

Thomas Aquinas and other church fathers on the issue:
http://turretinfan.blogspot.com/2010/08/thomas-aquinas-and-fathers-of-church-on.html

Augustine:
http://turretinfan.blogspot.com/2010/09/did-augustine-teach-sinlessness-of-mary.html