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Supplied information should be in the language of the manifestation. See RDA 2.3.2.11: "Use the language and script appropriate to the content of the resource being described, except where instructed to use specific terminology"; and the LC-PCC PS Alternative: "Devise a title in a language and script preferred by the agency preparing the description." The Rare Book Section interprets these instructions to mean that the language of the manifestation is preferable.
(NOTE: ADD EXTRA $$a BEING INSERTED IF 505 IS TOO LONG – MORE THAN 17?)