Classification
AHF - Research and science
8
GTA - Hydrology - general
3
CR - Nuclear chemistry, radiation chemistry
2
FLA - Low temperature physics - general aspects
2
PLA - Astrosciences - general
2
UXAH - Radioisotopes in water
2
AHZ - History of science and technology
1
AMA - Education - general
1
ETF - Fuel cells - general
1
FLB - Quantum liquids, quantum crystals
1
FLE - Superconductor materials
1
GFAC - Specific minerals
1
GHH - Sedimentary petrography - general
1
GKKF - Geothermic methods
1
LCR - Ecology of microorganisms - land and water
1
LWE - Agriculture - general aspects
1
PAD - Physics - comprehensive works
1
PDA - Mechanics - general
1
PKA - Elementary particles, nuclei - general
1
UCA - Environmental problems, man and environment - general aspects
1
UCJ - Environmental protection - general aspects
1
UPCE - Water chemistry
1
UPK - Water resources, water supply
1
YZA - Politics, political science
1
ZBEBB - Subject indexing
1