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P. Edmonds, A TECHNICAL EXAMINATION, INVESTIGATION, AND TREATMENT OF A 15TH-CENTURY SIENESE POLYCHROME TERRA-COTTA RELIEF ('MADONNA AND CHILD' ATTRIBUTED TO THE CIRCLE OF GIOVANNI-DI-TURINO, CURRENTLY IN THE NATIONAL-GALLERY-OF-ART, WASHINGTON), Studies in the history of art, 57, 1997, pp. 66-91