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Medium
- instructional materials18
- documentaries and factual works11
- timelines (chronologies)9
- sound recordings7
- black-and-white photographs6
- photographs6
- study guides6
- texts (document genres)6
- web sites6
- transcripts4
- articles3
- lesson plans3
- teaching guides3
- letters (correspondence)2
- maps2
- oral histories (literary works)2
- scrapbooks2
- annotated bibliographies1
- books1
- learning modules1