https://vocab.esis-web.org/tematres-en/vocab/https://vocab.esis-web.org/tematres-en/vocab/?tema=487subject headings https://vocab.esis-web.org/tematres-en/vocab/?tema=487 free-floating subdivisions NT https://vocab.esis-web.org/tematres-en/vocab/?tema=487 topical subdivisions NT https://vocab.esis-web.org/tematres-en/vocab/?tema=487 headings NT https://vocab.esis-web.org/tematres-en/vocab/?tema=487 components of controlled vocabularies BT