Introduction Preface New Descriptors Transferred Descriptors Invalid (Dead) Descriptors Deleted Descriptors ERIC's Indexing and Retrieval: 2000 Update Thesaurus Construction and Format ERIC Network Components Thesaurus of ERIC Descriptors Alphabetical Descriptor Display Rotated Descriptor Display Two-Way Hierarchical Term Display Descriptor Groups and Descriptor Group Display
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A 2002 study studied this question.