Geissen, A. Katalog alexandrinischer Kaisermünzen, Köln. (Cologne, 1974-1983).
Incredible collection with facing plates of all the coins. In German, with the usual difficulties in reading German. Helped by the coin photos, this catalog is very well done. Obverse inscriptions are given in modern Greek -- not as helpful as Milne or BMC. As well, the reverse date placement is not as accurate as Milne-- but as you can look at the coin photo and make your own determination as to whether you have a coin variety. For the specialist-- and expensive to purchase. All volumes may not be in print at this time. 5 Vols.
1. Augustus - Trajan
2. Hadrian - Antoninus Pius
3. Marcus Aurelius - Gallienus
4. Claudius Gothicus - Domitius Domitianus, Nomes, Lead tessera
5. Indices