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Archival Materials
753
Letters (correspondence)
649
Portraits
349
Articles
35
Pictorial Works
33
Posters
30
Notes
17
Postcards
14
Excerpts
13
Laboratory notebooks
12
Photographic prints
9
Drafts (documents)
8
Reports
6
Speeches
4
Diagrams
3
Photographs
3
Bibliography
2
Book Illustrations
2
Instructional Films and Videos
2
Memorandums
2