The BISAC system is maintained by the book Industry Study Group, which classifies books into 52 broad categories, each with additional levels of specificity.
BISAC分类体系是由图书工业研究小组(Book Industry Study Group)维护的，它把图书分为52大类，每一类下面又有进一步的细分。
The BISAC system is maintained by the book Industry Study Group, which classifies books into 52 broad categories, each with additional levels of specificity.
BISAC分类体系是由图书工业研究小组(Book Industry Study Group)维护的，它把图书分为52大类，每一类下面又有进一步的细分。
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