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Medium
- photographs[remove]360
- aerial views16
- instructional materials12
- articles8
- sound recordings8
- teaching guides7
- correspondence5
- timelines (chronologies)5
- black-and-white photographs4
- letters (correspondence)4
- newspaper clippings4
- oral histories (literary works)4
- texts (document genres)4
- web sites4
- documentaries and factual works3
- essays3
- group portraits3
- maps3
- writings3
- brochures2