These two publications, originally released as issues of the Journal of American Folklore, index all the Journal's contents from 1888 to 1994:

The Centennial Index: One Hundred Years of the Journal of American Folklore (1988; Bruce Jackson, Michael Taft, and Harvey S. Axlerod, compliers; originally published as JAF 101:402)

1988-1994 Supplement to The Centennial Index to the Journal of American Folklore (1994; Michael Taft, compiler; originally published as JAF 107:426)