Genre
Congresses
683
Juvenile literature
179
Periodicals
144
Early works to 1800
88
Biography
64
Popular works
39
Handbooks, manuals, etc
38
Pictorial works
36
Guidebooks
34
Classification
33
Maps
33
Identification
32
Dictionaries
31
Tables
29
Problems, exercises, etc
26
Laboratory manuals
24
Bibliography
23
Juvenile works
23
Geological maps
20
Atlases
17
Conference papers and proceedings
16
Miscellanea
16
Textbooks
16
Statistics
12
Outdoor books
11
Encyclopedias
10
Pre-Linnean works
10
Directories
9
Electronic books
9
Laboratory Manuals
9
Nomenclature
9
Catalogs
8
Sources
8
Observations
7
Programmed instruction
7
Charts, diagrams, etc
6
History
6
Illustrated works
6
Observers' manuals
6
Picture books
6
Case studies
5
Catalogs and collections
5
Documentary
5
Indexes
5
Correspondence
4
Documentary films
4
Documentary television programs
4
Early works to 1850
4
Early works to 1900
4
Electronic journals
4
more ...