Classification
ZCC - Information technology
67
ZCB - Information science
14
ZBHA - Library systems
5
ZBH - Digital library
4
YPD - Business economics
2
ZBDA - Library management
2
ZBEBB - Subject indexing
2
ZCA - Documentation
2
ZCD - Information retrieval
2
ZFA - Teaching materials, learning aids
2
AMA - Education - general
1
AQB - Reference guides to science and technology
1
ATE - Information service
1
ATEA - Information storage and retrieval
1
DNC - Internet
1
DPAD - Data mining, text mining, big data
1
DWI - Information management
1
ZBE - Library administration
1
ZBG - Library technology
1
ZBJ - Library types
1
ZBJA - Special libraries
1