Typescript of an English version of Saunders Lewis's libretto 'Serch yw'r Doctor', adapted from Molière's L'Amour Médecin, for an opera by Arwel Hughes. The Welsh text was published in Esther a Serch yw'r Doctor (Llandybïe, 1960).

Papers, [1979x1992], relating to a proposed opera on an adaptation of Balzac's 'Le Colonel Chabert', comprising letters and drafts of the libretto by Myfanwy Piper.