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Archival Materials
1,697
Letters (correspondence)
1,203
Pictorial Works
798
Posters
397
Postcards
293
Photograph
242
Excerpts
220
Transcripts
183
Legislation
179
Bibliography
147
Statistics
139
Portraits
138
Advertisements
106
Laboratory notebooks
99
Photographs
94
Catalogs
80
Articles
75
Congresses
71
Periodicals
70
Monographs
64