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Medium
- instructional materials11
- timelines (chronologies)11
- sound recordings8
- articles6
- photographs5
- black-and-white photographs4
- documentaries and factual works4
- letters (correspondence)4
- maps4
- teaching guides4
- learning modules2
- legislative records2
- study guides2
- texts (document genres)2
- transcripts2
- web sites2
- annotated bibliographies1
- biographies1
- biographies (literary works)1
- correspondence1