Possibly the swiftest route to your roots.
Irish genealogy website directory.
www.from-ireland.net/church-records-doud-brennan-croghan-roscommon/
Description:
The Roman Catholic Parish registers for this parish begin on 24th June, 1811 and continue through to 26th Dec 1880. The National Library of Ireland reference for the film is 4606. The LDS have a copy of this film according to my information, the reference is 0989741, items 1-4.
