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Medium
- oral histories (literary works)145
- interviews125
- transcripts98
- moving images91
- instructional materials25
- teaching guides14
- resource units12
- photographs11
- sound recordings8
- timelines (chronologies)8
- online exhibitions7
- video recordings (physical artifacts)6
- articles4
- black-and-white photographs3
- fliers (printed matter)3
- videotapes3
- web sites3
- biographies (literary works)2
- digital maps2
- lesson plans2