QD -- Chemistry
QD1-65 General, Including alchemy
QD71-142 Analytical chemistry
QD146-197 Inorganic chemistry
QD241-441 Organic chemistry
QD415-436 Biochemistry
QD450-801 Physical and theoretical chemistry
QD625-655 Radiation chemistry
QD701-731 Photochemistry
QD901-999 Crystallography
TP -- Chemical technology
TP155-156 Chemical engineering
TP200-248 Chemicals: Manufacture, etc