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Polythematic Structured Subject Heading System

Polythematic structured-subject heading system is a bilingual Czech–English controlled vocabulary of subject headings developed and maintained by the National Technical Library in Prague. It was designed for describing and searching information resources according to their subject. PSH contains more than 13,900 terms, which cover the main fields of human knowledge.
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    • History and development 

    • PSH structure 

    • PSH formats