Classification
546 - Inorganic chemistry
7
547 - Organic chemistry
6
574 - [Unassigned]
5
548 - Crystallography
3
661 - Industrial chemicals
2
530 - Physics
1
537 - Electricity & electronics
1
540 - Chemistry & allied sciences
1
541 - Physical chemistry
1
543 - Analytical chemistry
1
551 - Geology, hydrology & meteorology
1
572 - Biochemistry
1
662 - Explosives, fuels & related products
1
668 - Technology of other organic products
1
930 - History of ancient world to ca. 499
1