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Unesco thesaurus : a structured list of descriptors for indexing and retrieving literature in the fields of education, science, social science, culture and communication (1977) 9.06

9.06241 = weight(lcsh_ss:Subject headings in 424) [ClassicSimilarity], result of:
  9.06241 = fieldWeight in 424, product of:
    1.0 = tf(freq=1.0), with freq of:
      1.0 = termFreq=1.0
    9.06241 = idf(docFreq=13, maxDocs=44421)
    1.0 = fieldNorm(doc=424)

Lcsh: Subject headings
Subject: Subject headings