Genre
Periodicals
29
Technical reports
24
Statistics
19
Legislative hearings
17
Conference papers and proceedings
16
Maps
16
Congresses
11
Bibliographies
10
Legislative materials
7
Handbooks and manuals
3
Biographies
2
Case studies
2
Census data
2
Databases
2
Geographic information systems
2
Guidebooks
2
Indexes
2
Academic theses
1
Catalogs
1
Classification
1
Directories
1
Drawings
1
Field guides
1
Graphs
1
Identification
1