Question

many useful Indian historical sources either have been losted or destroyed​

Answer 1

Answer:

Coins Pillers Monuments Inscription

Answer 2

Something is rotten about the state of the National Archives of India. The heritage Lutyens building houses priceless historical documents, “stored in over 40 km of shelf space”, according to Sanjay Garg, deputy director of the archives. These include documents dating back to 1748, a rich collection of private papers, over 7,500 microfilm rolls and records from several countries. Scholars, academics, authors, journalists and students frequent the repository. Outstanding works by renowned authors and researchers have emanated from this goldmine.