Letter	Sub heading
A	Swedish studies generally
B	Swedish language
BM	Old Swedish language
C	Swedish literature generally
E	Medieval literature, to 1526
H	Sixteenth and Seventeenth- century literature, 1526-1732
L	Eighteenth-century literature, 1732-1809
N	Literature of the Age of Romanticism, 1809-1880
P	Literature of the Age of Realism and Naturalism, 1880-1910
Q	Early Twentieth-century literature, 1910-1940
R	Twentieth-century Literature from 1940
S	Contemporary literature from 2000
XA	Swedish culture in Finland generally
XB	Swedish language in Finland
XC	Swedish literature in Finland from 1809
XN	Literature of the Age of Romanticism, 1809-1885
XQ	Literature of the Age of Realism, 1885-1918
XR	Twentieth-century literature from 1918
XS	Contemporary literature from 2000
Z	Miscellaneous works by Swedish authors