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Medium
- instructional materials[remove]138
- documents53
- teaching guides46
- resource units28
- interviews23
- transcripts23
- photographs22
- timelines (chronologies)21
- lesson plans20
- sound recordings18
- oral histories (literary works)17
- texts (document genres)12
- web sites12
- black-and-white photographs11
- articles10
- fliers (printed matter)7
- letters (correspondence)6
- maps (documents)6
- online exhibitions6
- video recordings (physical artifacts)6