Classification
USN - Waste water treatment
2
YPD - Business economics
2
YPJ - Accounting
2
YRC - Technology and society
2
AHF - Research and science
1
EUA - Energy conservation - general
1
GCA - Regional geology
1
GRA - Meteorology
1
GRB - Climatology
1
GWDA - Manganese nodules - occurrence, deep ocean mining
1
TBH - Power electronics, rectifiers, thyristors
1
TCLD - Electromagnetic compatibility, pulse technique
1
TNK - Nuclear reactor components - general
1
UA - Environment - general
1
UHCD - Parks and recreation areas
1
UXE - Nuclear radiation effects, radiation hazards
1
UXNB - Radiation protection relating to reactor safety, reactor accidents
1
YBB - Law - general
1
YPGH - Planning and controlling
1