The world's published literature on folklore has been extensively collected, cataloged and classified. All of the sources below provide access to folk tales.
The Types of International Folktales: A Classification and Bibliography (Uther)
GR 1 .F55 West Stacks, Fletcher Library
An 2004 update of the classic Motif-Index of Folk Literature.
Motif - Index of Folk Literature (Thompson)
GR 72.56 .T48 1989 West Stacks, 6 vols.
AND ONLINE
Subtitle: "A Classification of Narrative Elements in Folktales, Ballads, Myths, Fables, and Mediaeval Romances, Exempla, Fabliaux, Jest-Books & Local Legends."
Type & Motif Index of the Folktales of England and North America (Baughman)
GR 67.B3 West Stacks
An index & motif classification of English and North American folktales.
A Guide to Folktales in the English Language
GR 74.6 .A84x West Stacks
Another motif index to English language folktales. Good for giving variations.
A Dictionary of British Folk-Tales in the English Language, 2 vols.
GR 141.B69 West Stacks, 2 vols.
Contains summaries of tales. Also has a tale-type index and an index to story titles.
Index to Fairy Tales 1949-1986: Including Folklore, Legends, and Myths in Collections, 3 vols.
PN 3437 .I7x 1985 West Stacks and
GR550 .s67x 1994 West Stacks
An index to collections of fairy tales and folklore from books published between 1949 1986. The index is by subject and title.
Dictionary of Chicano Folklore
GR 111 .M49 C37 2000 West Ref
South Asian Folklore: An Encyclopedia
GR 302 .S68 2003 West Stacks
African Folklore: An Encyclopedia
GR 350 .A33 2004 West Stacks