Genre
- periodicals159
- newsletters136
- photographs130
- serials (publications)105
- black-and-white photographs93
- publications (documents)84
- drawings (visual works)60
- botanical illustrations52
- scientific illustrations (images)52
- watercolors (paintings)48
- pamphlets44
- color photographs36
- architectural drawings (visual works)33
- correspondence31
- letters (correspondence)31
- posters25
- color slides24
- slides (photographs)24
- sound recordings16
- oral histories (literary genre)15
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