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trefwoorden

Cross-reference index

By Thomas V. Atkins

Die Schlagwortnormdatei

By Stephan, Werner

Thesaurus of ERIC descriptors

By United States. Office of Education

Classification and indexing in the humanities

By Derek Wilton Langridge

Thematic list of descriptors--economics

By International Committee for Social Science Information and Documentation

Concepts and Subject Headings

By John M. Christ