Classification
YRB - Social sciences, sociology
16
YZA - Politics, political science
14
YPO - Economic policy
11
YRA - Social studies
11
YRC - Technology and society
9
YPB - Economy - general aspects
6
AHP - Philosophy
3
YPG - Business management
3
YPM - National economy
3
AAE - Popular science - general aspects
2
AHF - Research and science
2
HDG - Psychology, psychiatry
2
UMV - Climatic change
2
YRAB - Gender studies
2
YRE - Risk assessment
2
A
1
AHPC - Ethics
1
AHX - History - general
1
AQAD - Reference guides to the Internet
1
AYA - Sciences - general aspects
1
DNC - Internet
1
DZC - Man and computer
1
EAE - Energy - general
1
EXA - Energy policy
1
UCA - Environmental problems, man and environment - general aspects
1
UED - Environmental policy
1
UXPN - Nonproliferation, nuclear weapons
1
YDE - Financial law, budgetary law
1
YMA - International law
1
YPC - Public administration
1
YPD - Business economics
1
YPF - Labour science
1
YPS - Economy of the developing countries
1
YRAF - Equal opportunities
1
YRCD - Informatics, information and society
1