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Portraits
1,208
Archival Materials
645
Letters (correspondence)
513
Pictorial Works
59
Photographic prints
52
Photographs
41
Postcards
26
Articles
22
Posters
19
Excerpts
16
Reports
13
Laboratory Manuals
8
Photograph
7
Portrait
7
Laboratory notebooks
6
Speeches
6
Instructional Films and Videos
5
Advertisements
4
Notes
4
Bibliography
3