Classification of ancient engraved gems : a study based on the collection in the Royal Coin Cabinet, The Hague, with a history of that collection / Marianne Maaskant-KleibrinkCatalogue of the engraved gems in the Royal Coin Cabinet, The Hague : the Greek, Etruscan and Roman collections / Marianne Maaskant-KleibrinkThe engraved gems : Roman and non-Roman / by Marianne Maaskant-Kleibrink ; [ill. Irina Diakonoff]Gesneden stenen / Marianne Groen-van Andel ; [foto's P. Brouwers ... et al.]