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The collection holds some 80million records, including the newly updated Boston Archdiocese Catholic Sacramental Records collection which dates from 1789 to 1900.
You can see a full listing of the record sets included in the Irish Heritage Collection here.
Access to the records in the featured collection will be free until 11:59pm ET on Monday 19 March.
To start your search, click the image. If you don't already have an account, you'll need to register for one. It's a quick and easy process, and you don't have to provide more detail than your name and email address.