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Medium
- instructional materials150
- documents58
- teaching guides34
- photographs24
- timelines (chronologies)22
- oral histories (literary works)20
- resource units19
- texts (document genres)18
- interviews17
- lesson plans17
- web sites16
- sound recordings15
- transcripts15
- black-and-white photographs14
- online exhibitions12
- articles8
- maps (documents)7
- bibliographies6
- documents (object genre)6
- video recordings (physical artifacts)6