Classification
GWBA - Raw material resources, raw material reserves
117
FNF - Polymer science - general aspects
11
GWA - Raw material economy, raw material policy
7
EFA - Petroleum, natural gas
5
GCAC - Regional geology - noneuropean countries
5
GMAD - Organic geochemistry
5
GMP - Geochemical exploration
5
EFE - Petroleum geology
4
GWAB - National raw material reports
4
GWBB - Raw material supply, raw material demand
4
ECA - Energy resources
3
GAN - Geosciences - mathematical methods, computer applications
3
GCAA - Regional geology - Germany
3
GWAA - Raw material programs
3
EFK - Petroleum deposits, natural gas deposits
2
EFP - Petroleum production, natural gas production
2
EGA - Oil shale, oil sands
2
EPA - Uranium - nuclear fuel
2
GBAH - Stratigraphy, history of earth
2
GWC - Ore deposits
2
CE - Organic chemistry
1
CER - Macromolecular compounds - synthesis and reactions
1
CWE - Chemical engineering, chemical industry - general
1
CXA - Coal and fossil fuel - chemistry and technology
1
CXRC - Natural gas
1
CXRS - Petroleum
1
EAA - Energy - reference books
1
EXA - Energy policy
1
EYA - Energy problems of developing countries
1
GBA - General geology, historical geology
1
GBEC - Geomorphology
1
GBH - Marine geology
1
GCAB - Regional geology - european countries
1
GHAB - Rocks - physical properties
1
GHH - Sedimentary petrography - general
1
GHHD - Sedimentary transport, sedimentation
1
GHHF - Sedimentary basins
1
GHMA - Clay, shale
1
GHMB - Sandstone, conglomerate
1
GMK - Geochemistry of elements, minerals, rocks
1
GNA - Geology - soil sciences
1
GPAB - Flora, vegetation - geographical aspects
1
GRA - Meteorology
1
UAM - Environmental models
1