• Subject(s)

    Library of Congress Subject Heading and National Library of China’s subject headings are followed for standarisation. This field covers all subjects such as topical, geographical and people. Results are abstracted from any part of a subject. When searching the word “commerce”, subject headings with this word would be extracted. Boolean Search (AND, OR and NOT) is applicable in this field.

    e.g.           China -- Commerce – History

                     Commerce -- Dictionaries

                     Great Britain -- Commerce -- China -- History