| A. de Bonis Rome, Cloister of San Pietro in Vincoli 1860 (ca) Albumen print 24.7 x 19,5 ins (41.5 x 29.4 cm) Private collection of Giovanni Fanelli LL/55578 Source for an Illustration by Émile Thérond.
Francis Wey, 1872, Rome, Description et souvenirs, (Paris: Hachette), p. 330
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