Classification
EAA - Energy - reference books
6
TAA - Engineering sciences - reference books
4
UAA - Environment - reference books
4
EAD - Energy - comprehensive works
2
CXA - Coal and fossil fuel - chemistry and technology
1
EEA - Coal - general
1
EFA - Petroleum, natural gas
1
EVN - Energy supply - future aspects
1
FAF - Materials research - comprehensive works
1