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Medium
- web sites[remove]28
- instructional materials10
- texts (document genres)9
- timelines (chronologies)9
- black-and-white photographs5
- photographs5
- documentaries and factual works4
- sound recordings4
- study guides4
- articles2
- biographies2
- interviews2
- lesson plans2
- maps2
- annotated bibliographies1
- essays1
- fliers (printed matter)1
- identification photographs1
- interactive resource1
- learning modules1