The Index Translationum is an international bibliography of book translations maintained
by UNESCO (12). The online database contains information on books translated and published in
print in about 150 countries since 1979. Some countries are missing data for certain years, such
as the United Kingdom in the years 1995-2000 and 2009-2011 (13).
We retrieved a dump of the data on July 22, 2012, which contained 2,244,527 translations
in 1,160 languages. After removing a few corrupt entries, we converted the language codes listed
in the Index Translationum to standard three-letter ISO639-3 codes. The following entries were
discarded from the dataset: 41 miscellaneous dialects of languages that were already listed
(together accounting for under 100 translations total), 46 languages that could not be mapped to
standard ISO639-3 codes (together accounting for about a thousand translations total), and 5
administrative codes (mis, mul, und, zxx, and not supplied; see ISO639-3 documentation (9) ).
The remaining languages were merged into macrolanguages (see Section S2.1).
Table shows statistics for the languages with the most translations in our dataset. The
final dataset contains 2,231,920 translations in 1,019 languages.
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