Letter	Sub heading
A	General
B	Phonetics and physiology
C	Phonetics and phonology of particular languages: English
CB-CR	Phonetics and phonology of particular languages: other languages
D	Phonological theories
E	Genetical phonetics
F	Instrumental and experimental phonetics
H	Prosodic features and suprasegmental features
K	Phonetics and psychology
L	Phonetics and other fields of research