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Archival Materials
526
Letters (correspondence)
421
Excerpts
45
Laboratory notebooks
32
Articles
17
Drafts (documents)
12
Postcards
11
Statistics
10
Legislation
9
Photographs
8
Reports
8
Speeches
7
Congresses
6
Atlases
5
Bibliography
5
Memorandums
5
Technical Report
5
Instructional Films and Videos
4
Notes
4
Diaries
3