Classification
YUC - Comprehensive statistical data
5
AMA - Education - general
1
EAA - Energy - reference books
1
EBA - Energy production, energy technology
1
EBA - Energy production, energy technology
1
ECA - Energy resources
1
HYB - Public health, health politics
1
LVE - Food science - general
1
LWA - Agriculture - reference books
1
YPA - Economy - encyclopaedic glossaries
1
YPB - Economy - general aspects
1
YUC - Comprehensive statistical data
1
YUD - Comprehensive statistical data - Germany
1