I have a collection of over 30 Greek coins - most are square, such as Eukratides, Apollo and Lysias. I am new to collecting Greek coins and wonder if there a book or software you can recommend to me.

This coin is probably Philoxenos, Indo-Greek, 110-80 BC. It would help to know the weight and be certain about the metal, but guessing:

O: Demeter holding a cornucopia, mint mark Pushkalavati, AE hemi-obol
R: Humped bull
Maharajasa apadihatasa Philasinasa

The references are:

• Mitchiner, Indo-Greek and Indo-Scythian Coinage (this coin in Volume 3) and
• Bopearachchi; Monnaies Greco-Bactriennes Et Indo Grecques Catalogue Raisonne, Bibliotheque Nationale, Paris, 1991, 459 Pages, 69 plates
• SNG ANS Part 9 (Bopearachchi)