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Line 733:
if year and not ignore_invalid then --
year = year:match ('%d%d%d%d?'); -- strip disambiguator if present
if year and (1965 > tonumber(year)) then
set_message ('err_invalid_isbn_date'); -- set an error message
return internal_link_id ({link = handler.link, label = handler.label, redirect = handler.redirect,
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