High Quality Content by WIKIPEDIA articles! The sources used to reconstruct the history of the Indo-Greeks are few and disparate, leading to much uncertainty about the precise state of the Indo-Greek kingdom and its chronology. Sources related to the Indo-Greeks can be classified into various categories: ancient literary sources from both the West and the Indian world, archaeological sources from the general area of Northwestern India, and numismatical sources, which are abundant and well-preserved but often rather cryptic.