Holographs, signed. In three movements. First movement exists as separate work, Trio de concert, also known as Trio “Le Londres”, op. post. Cf. version published: Brussels: Éditions Ysaÿe, c1970. Title from 1st violin part. “A Monsieur le Docteur Léon Laruelle.” Includes revisions by the composer, both pencilled and laid in.

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