Letter	Sub heading
A	Norwegian studies generally
B	Norwegian language
BM	Old Norwegian language
C	Norwegian literature generally
E	Medieval literature, to 1500
H	Sixteenth and Seventeenth-century literature
L	Eighteenth-century literature, 1700-1814
N	Literature of the Age of Romanticism, 1814-1875
P	Literature of the Age of Realism, 1875-1920
R	Twentieth-centrality literature from 1920
S	Contemporary literature from 2000
Z	Miscellany works by Norwegians