Answer: Archaeological excavations
Notes: The archaeological sources are immense when it comes to rediscovering the harappan civilization. There are 100s of sites uncovered which belong to the harappan period which include Harappa, mohenjodaro, lothal, Dholavira, nageshwar, balakot, Rakhigarhi etc. With each site having its unique evidence and structures such as the great bath at mohenjodaro, the reservoir at Dholavira and the traces of bead making worksops which include the tools used for making beads and it is clear what each site was used for.
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