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Medium
- instructional materials8
- photographs6
- articles5
- sound recordings5
- teaching guides5
- timelines (chronologies)5
- letters (correspondence)4
- black-and-white photographs3
- maps (documents)3
- documentaries and factual works2
- legislative records2
- lesson plans2
- maps2
- texts (document genres)2
- transcripts2
- web sites2
- annotated bibliographies1
- correspondence1
- interviews1
- learning modules1