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Medium
- instructional materials8
- timelines (chronologies)8
- sound recordings6
- articles5
- photographs5
- documentaries and factual works4
- letters (correspondence)4
- maps4
- black-and-white photographs3
- legislative records3
- teaching guides3
- reports2
- study guides2
- texts (document genres)2
- transcripts2
- web sites2
- annotated bibliographies1
- correspondence1
- interviews1
- learning modules1