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The Library of Congress > Linked Data Service > ISO639-1 Languages

From ISO 639-1: Codes for the Representation of Names of Languages - Part 1: Two-letter codes for languages

us: Church Slavic | Old Slavonic | Church Slavonic | Old Bulgarian | Old Church Slavonic

fr: slavon d'église | vieux slave | slavon liturgique | vieux bulgare

de: Kirchenslawisch