Call-number ranges that might be useful:
BL 300-325 = Myth and comparative mythology.
BL 830-875 = History and Principles of Religions–Germanic and Norse.
DL = History of Northern Europe, Scandinavia.
DL 301-398 = Iceland.
GR = Folklore.
PN = Literature (general), including theory and criticism.
PN441-1009.5 = Literary History.
PT = Germanic-language Literature.
PT 7101-7338 = Old Norse Literature (Old Icelandic and Old Norwegian).
The Library of Congress has a detailed guide showing a breakdown of call numbers.
Library catalogs and some databases use subject terms to bring together all the works on a particular topic, regardless of the words or phrases authors use. Unlike keywords, subject terms are often not intuitive. This is a list of selected subject terms related to Norse mythology and literary theory. Try using them alone or in combination with each other or other keywords when you search the UW Library Catalogs.