Genre
Databases
197
Electronic books
142
Statistics
128
Bibliography
88
Catalogs
73
Directories
70
Maps
68
Handbooks, manuals, etc
65
Periodicals
58
Indexes
55
Electronic reference sources
37
Remote-sensing images
32
Blogs
28
Web sites
26
Abstracts
24
Internet resources
23
Electronic journals
22
Popular works
21
Sources
18
Computer network resources
17
Dictionaries
17
Online databases
14
Encyclopedias
13
Forms
13
Public service radio programs
11
Educational radio programs
8
Podcasts
8
Database
7
Rules and practice
7
Video recordings
7
Biography
6
Cases
6
Bathymetric maps
5
Bio-bibliography
5
Census
5
Classification
5
Correspondence
5
Electronic encyclopedias
5
Pictorial works
5
Congresses
4
Tables
4
Telephone directories
4
Case studies
3
Interactive multimedia
3
Juvenile literature
3
Newspapers
3
Nomenclature
3
Terminology
3
Aerial photographs
2
Archives
2
more ...