Classification
YPQ - National income accounting
6
YPO - Economic policy
5
YPB - Economy - general aspects
4
YPM - National economy
2
YPS - Economy of the developing countries
2
YRAF - Equal opportunities
2
LWE - Agriculture - general aspects
1
UED - Environmental policy
1
UMV - Climatic change
1
YPD - Business economics
1
YPW - Economy of industry branches
1
YRA - Social studies
1