I was told my relatives came from Tuam.My daughter(who lives 5mls from Tuam)and I spent a good couple of hours copying births and marriages from the registers for 1790-1900.These were in the Presbytery in Tuam.The secretary told us that Tuam records are stored by The Mormons.,Salt Lake City,Utah,USA.May be worth looking there.
Elaine
ps..we didnt find anyone with the names we were looking for...my gt gt grandad,Denis Mahon,and his father,Joseph,so it's back to research for me!