Genre
Maps
399
Guidebooks
129
Congresses
114
Geological maps
111
History
78
Topographic maps
71
Conference papers and proceedings
66
Educational films
56
Documentary films
55
Nomenclature
51
Bibliography
48
Documentary television programs
47
Legislative hearings
44
Science films
41
Terminology
40
Legislative materials
33
Biography
24
Periodicals
20
Science television programs
15
Juvenile literature
14
Criticism, interpretation, etc
13
Charts, diagrams, etc
12
Biographies
11
Databases
11
Handbooks, manuals, etc
11
Nonfiction films
11
Congress
10
Remote-sensing maps
10
Short films
10
Early works to 1800
9
Pictorial works
9
Popular works
8
Remote-sensing images
8
Nonfiction television programs
7
Handbooks and manuals
6
Bibliographies
5
Case studies
5
Classification
5
Abstracts
4
Children's films
4
Diaries
4
Directories
4
Filmed lectures
4
Juvenile works
4
Observations
4
Textbooks
4
Autobiographies
3
Bathymetric maps
3
Catalogs
3
Correspondence
3
more ...