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Alan D. Deyermond 
This article, based on Alan Deyermond's project to catalogue the so-called lost works of medieval Castilian literature, first appeared in volume 5, number 2 of La corónica in 1977. He would go on to publish over the next 20+ years a series of articles on the subject, including a book-length study of lost epic and ballads in 1995.
