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Medium
- instructional materials[remove]12
- timelines (chronologies)8
- articles5
- sound recordings5
- texts (document genres)5
- black-and-white photographs4
- documentaries and factual works4
- maps4
- teaching guides4
- biographies3
- photographs3
- study guides3
- correspondence2
- learning modules2
- lesson plans2
- letters (correspondence)2
- web sites2
- annotated bibliographies1
- encyclopedias1
- interviews1