What authority research is needed for obscure topics or topics not likely to be found in sources other than in the work being cataloged?
Although the topic may be found only in the work being cataloged, other sources appropriate to the subject area in question should be cited (in the 675) to demonstrate that the topic was properly investigated. There may be some situations, for example, an individual archaeological site or computer language, where the only available information is found in the work being cataloged. Remember in those cases, it is useful and important to cite pertinent explanatory information from the work (in 670 $b) as succinctly as possible.
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