CohenH. Cohen. Description historique des monnaies frappées sous l’Empire Romain. 8 Vols. (Paris, 1880-92)Volume 1: Pompey to Domitian - Online (1880) Volume 2: Nerva to Antoninus Pius - Online (1883) Volume 3: Marcus Aurelius to Clodius Albinus - Online (1883) Volume 4: Septimius Severus to Maximinus Thrax - Online (1884) Volume 5: Gordian I to Valerian II - Online (1885) Volume 6: Macrianus to Diocletian & Maximianus - Online (1886) Volume 7: Carausius to Constantine & sons - Online (1888) Volume 8: Nepotian to Romulus Augustus, plus tesserae & cotorniates - Online (1888)