Genre
Maps
66
Periodicals
16
Legislative materials
15
Statistics
10
Technical reports
6
Biographies
4
Handbooks and manuals
4
Conference papers and proceedings
3
Guidebooks
3
Legislative hearings
3
Serial publications
3
Autobiographies
2
Bibliographies
2
Catalogs
2
Databases
2
Directories
1
Encyclopedias
1
Geographic information systems
1
Illustrated works
1
Index maps
1
Observations
1
Statistics, Medical
1
Use studies
1