The syndetic structure is comprised of three relations, namely 'broader', 'narrower' (i.e., hierarchical relations) and 'related' (i.e., associative relation) [18]. Apart from the syndetic structure, LCSHs are indirectly associated through their (possibly) common subdivisions. There are four types of subdivisions according to the LCSH guidelines4; topical subdivisions, form subdivisions, geographical subdivisions, and chronological subdivisions.