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Medium
- instructional materials73
- documents32
- photographs15
- timelines (chronologies)14
- black-and-white photographs13
- oral histories (literary works)12
- sound recordings12
- interviews11
- teaching guides11
- texts (document genres)11
- transcripts10
- lesson plans8
- resource units8
- web sites8
- documentaries and factual works7
- articles6
- online exhibitions4
- video recordings (physical artifacts)4
- annotated bibliographies3
- bibliographies3