Classification
ZBHC - Electronic publishing
22
ZAB - Media studies (without bibliology)
3
ZAD - Book trade, publishing
2
ZBE - Library administration
2
ZBH - Digital library
2
DUA - Text and document processing
1
DWI - Information management
1
ZBEA - Acquisition, collection development
1
ZBEBA - author, title approach
1
ZBEBB - Subject indexing
1