Classification
ZBDC - Library marketing
31
YPGK - Marketing
2
ZBDA - Library management
2
ZBEC - Reader services, inquiry service
2
ZBJ - Library types
2
YPD - Business economics
1
YPGL - Public relations
1
ZBEA - Acquisition, collection development
1
ZBH - Digital library
1
ZBJA - Special libraries
1
ZBJB - Library federations
1
ZCB - Information science
1