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Medium
- instructional materials7
- teaching guides4
- sound recordings3
- timelines (chronologies)3
- annotated bibliographies2
- articles2
- black-and-white photographs2
- legislative records2
- letters (correspondence)2
- oral histories (literary works)2
- photographs2
- study guides2
- documentaries and factual works1
- interviews1
- maps1
- maps (documents)1
- resource units1
- texts (document genres)1
- transcripts1
- web sites1