Answer: They tell about the inventories, wills, private letters, legal deeds, ballads,and poems of these homelands. The documents are written in different languages that corresponds with their regions like Sanskrit in India,Tibetan in Tibet, Sogdian in Ancient Iran, Parthian in Northeast Iran, and many more.
Two other similarities between these civilizations is the use of a calendar, which they used to predict eclipses, schedule religious ceremonies, and determine when to plant/harvest crops, and go off to war.
