Catholic
CATHOLIC
Genealogical Resources & Services of St. Mary's Seminary & University - St. Mary's was the earliest large Catholic settlement in Maryland and the families there pioneered early to places like Ohio, Kentucky, Southwest Pennsylvania etc. taking their religion with them.
Local Catholic Church and Family History & Genealogical Research Guide
NY: Inventory of the Church Archives in NY City - from NY Cnuts.net
PA: History of the Catholic church in the dioceses of Pittsburgh and Allegheny from establishment to 1880