Coins of the Bactrian and Indo-Greek Rulers

Coins of the Bactrian and Indo-Greek Rulers (BIGR) is an innovative research tool which provides a typology and catalogue of the coins issued under the Graeco-Bactrian and Indo-Greek kings and queens who ruled over an area consisting of parts of modern-day Afghanistan, Tajikistan, Uzbekistan, Turkmenistan, eastern Iran, and Pakistan. From the initial period of independence of the Graeco-Bactrian kingdom from the Seleucid empire under Diodotus I in the mid-third century BCE to the final Indo-Greek rulers at the beginning of the first century CE, coins provide the best, and in many cases, only evidence of the sovereigns under whom they were produced. Given the lack of other sources, much about the history of this period is uncertain and BIGR aims to make clear the limits of our knowledge, for example, by avoiding mint attributions and specific dates.
https://numismatics.org/bigr/