Why is the mother's maiden name missing from all Irish civil births for the year 1933 ONLY?
Using the record set 'Ireland Civil Registration Indexes, 1845-1958'.
The mother's maiden name is included on the index for births up to and including 1932, and from 1934. But, the index does not appear to show the mother's maiden name on any 1933 records.
What is the reason for this please?