Classification
YPB - Economy - general aspects
4
AHK - Scientific work
2
YPJ - Accounting
2
MAD - Mathematics - comprehensive works
1
MWH - Statistics
1
YDE - Financial law, budgetary law
1
YMA - International law
1
YPD - Business economics
1
YPO - Economic policy
1
YZA - Politics, political science
1
ZBEBB - Subject indexing
1