Genre
- periodicals282
- newsletters234
- serials (publications)181
- photographs154
- publications (documents)134
- black-and-white photographs95
- pamphlets80
- oral histories (literary genre)73
- reminiscences73
- sound recordings69
- correspondence67
- letters (correspondence)64
- interviews63
- drawings (visual works)61
- color photographs58
- botanical illustrations52
- scientific illustrations (images)52
- watercolors (paintings)48
- posters46
- color slides42
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