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Medium
- instructional materials15
- photographs[remove]15
- timelines (chronologies)8
- lesson plans6
- texts (document genres)6
- articles5
- sound recordings5
- black-and-white photographs4
- web sites4
- documentaries and factual works3
- legislative records3
- letters (correspondence)3
- maps3
- maps (documents)3
- oral histories (literary works)3
- teaching guides3
- transcripts3
- fliers (printed matter)2
- learning modules2
- advertisements1