Genre
Electronic books
1,151
Statistics
273
Congresses
125
Periodicals
122
Libros electronicos
67
Electronic book
55
Case studies
36
Statistics, Vital
34
Maps
33
Census
28
Biography
24
Documentary films
23
Early works to 1800
20
Electronic journals
20
Sources
14
Vital statistics
13
Census, 1980
12
Educational films
11
Handbooks, manuals, etc
11
Television news programs
11
Bibliography
9
Documentary television programs
9
Census, 1990
8
History
8
Census, 1940
7
Census, 2000
7
Tables
7
Cross-cultural studies
6
Forecasts
6
Census, 1970
5
DVD-Video discs
5
Documentary
5
Indexes
5
Internet videos
5
Textbooks
5
Census, 1910
4
Databases
4
Encyclopedias
4
Estadisticas
4
Feature films
4
Film excerpts
4
Juvenile literature
4
Videorecording
4
Census, 1860
3
Census, 1960
3
Correspondence
3
Drama
3
Environmental films
3
Essays
3
Longitudinal studies
3
more ...