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Medium
- instructional materials7
- maps (documents)4
- photographs4
- teaching guides4
- lesson plans3
- timelines (chronologies)3
- articles2
- black-and-white photographs2
- letters (correspondence)2
- sound recordings2
- texts (document genres)2
- web sites2
- documentaries and factual works1
- documents1
- editorials1
- legislative records1
- resource units1
- transcripts1