Letter	Sub heading
A	General
B	Indo-European languages
C	Ural-Altaic languages
D	Asianic and Middle-Eastern languages (non-Semitic)
E	Afro-Asiatic languages (Hamito- Semitic)
F	African languages (non-Semitic)
G	Basque and the ancient languages of the Iberian peninsula
H	Caucasian languages
K	Dravidian languages
L	Languages of Eastern Asia
M	Malayo-Polynesian and Papuan languages
N	Australian languages
P	American languages
R	Paleo-Asiatic and Eskimo-Aleut languages