A-Crystal Engraving, Here Identified as by Giovanni Bernardi. (Kunsthistorisches Museum, Vienna); B-Entombment. Crystal Engraving by Valerio Belli. (Private Collection, Vienna); C-Plaquette by Giovanni Bernardi. (Berlin); D-Entombment. Bronze Plaquette from a Crystal Engraving by Valerio Belli in the Vatican (Berlin). Two Unknown Crystal Engravings. St. John. Nottingham Alabaster, 1420-30. (Royal Collection, Sigmaringen). The Literature of Art: Die Bildwerke der füerstlich Hohenzollernschen Sammlung Sigmartngen