Letter	Sub heading
A	General
B	General & descriptive linguistics
C	Linguistics of particular languages: English
CB-CR	Linguistics of particular languages: other languages
D	Comparative descriptive linguistics
E	Sociolinguistics
EB	Dialectology & linguistic geography
F	Computational & statistical linguistics
G	Applied linguistics
H	Linguistics & literature
K	Philosophy & psychology of language
L	Language studies in other fields of research