Hugh Wallis’s batch number web site can be found at http://freepages.genealogy.rootsweb.ancestry.com/~hughwallis/IGIBatchNumbers
.htm
Familysearch has a further explanation at
https://wiki.familysearch.org/en/Finding_the_Source_of_IGI_Batch_Numbers
And they give a link to
http://www.pricegen.com/resources/globalbatchnumbers.htm which explains more about how to research using batch numbers
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