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Medium
- instructional materials8
- timelines (chronologies)[remove]8
- sound recordings5
- maps4
- articles3
- black-and-white photographs3
- documentaries and factual works3
- photographs3
- teaching guides3
- learning modules2
- legislative records2
- letters (correspondence)2
- reports2
- study guides2
- texts (document genres)2
- web sites2
- annotated bibliographies1
- biographies1
- correspondence1
- interviews1