Parish Registers
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The cited information was sourced from Website / URL published in 1973 <
http://www.familysearch.org/eng/> The author/originator was Church of the Later Day Saints. This citation is considered to be secondary evidence, data officially recorded sometime after event.
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Source Notes
To find the Parish Register, first find the Individual in the IG Index. Then select the Batch No. link at the bottom of the page. This will take you to another IGI search using the Batch No. which will then list the Parish Register with your original individual AND OTHERS of the same surname/dates etc.
NOTE: I think this 'source' is now defunct and superseeded by the newer familysearch portal.