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Medium
- instructional materials38
- teaching guides15
- sound recordings13
- timelines (chronologies)11
- articles10
- black-and-white photographs10
- lesson plans9
- photographs9
- documentaries and factual works7
- web sites7
- texts (document genres)6
- maps5
- resource units5
- interviews4
- letters (correspondence)4
- slide shows4
- transcripts4
- biographies3
- learning modules3
- maps (documents)3