Genre
Treaties
1,956
Conference papers and proceedings
460
Handbooks and manuals
215
Congresses
141
Statistics
93
Biographies
89
Technical reports
63
Bibliographies
58
Catalogs
49
Illustrated works
47
Dictionaries
41
Autobiographies
37
Encyclopedias
35
Atlases
33
Literature
33
Case studies
32
Exhibition catalogs
31
Classification
29
Maps
23
Anecdotes
16
Directories
16
Sources
13
Databases
11
Festschriften
11
Picture books
11
Identification
10
Textbooks
10
Environmental impact statements
9
Guidebooks
9
Academic theses
8
Yearbooks
8
Laboratory manuals
7
Trivia and miscellanea
6
Chronologies
5
Indexes
5
Problems and exercises
5
Soil surveys
5
Statutes and codes
5
Architectural drawings
4
Music
4
Diaries
3
Early works to 1800
3
Geographic information systems
3
Graphs
3
History
3
Interviews
3
Observations
3
Patents
3
Personal correspondence
3
Personal narratives
3
more ...