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Pictorial Works
415
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81
Letters (correspondence)
73
Transcripts
63
Bibliography
24
Statistics
23
Congresses
18
Posters
17
Tables
16
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11
Postcards
9
Atlases
7
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7
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5
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5
Technical Report
5
Periodical Index
4
Periodicals
4
Collected Works
3
Memorandums
3