"The classification codes and descriptions are broad subject headings that are specific to various databases. (...) Each code is prefaced by another two-character code that indicates in which database or equivalent printed abstracts journal, the record originally appeared."
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| URI | http://bartoc.org/en/node/1078 |
| Homepage | http://proquest.libguides.com/ld.php?content_id=3028189 |
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