गुजरात में स्थित कौनसा हड़प्पाकालीन स्थल पशुपालकों और मवेशी पालन का एक बहुत बड़ा केन्द्र माना जाता था?

In Ancient Indian Statecraft, Kautilya's 'Rajamandala' theory primarily deals with:

The First Buddhist Council was held at ______.

Which ancient Indian text contains references indicating that population counts or census-like records were maintained in ancient India?