library_of_congress_subject_headings

1. Library of Congress Subject Headings: 美国国会图书馆标题表 | 米国议会図书馆件名标目表 | 美国国会图书馆主题标目

1.BISAC levels of specificity complement Library of Congress Subject Headings, allowing patrons to drill down into a topic in an intuitive system of guided navigation.
BISAC的等级补充了国会图书馆的主题词，让读者能够在带有导航功能的系统中进入某一个具体的主题。
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