You can visit Abhilekh patal (link is external) [9] search web portal of the department for Reference Media and Digitized Papers.
Links:
[1] https://nia.businesstowork.com/content/general-information-records-holdings
[2] https://nia.businesstowork.com/content/public-records-0
[3] https://nia.businesstowork.com/content/cartographic-records
[4] https://nia.businesstowork.com/content/departmental-records
[5] https://nia.businesstowork.com/content/private-papers-0
[6] https://nia.businesstowork.com/content/oriental-records-0
[7] https://nia.businesstowork.com/content/microfilm-rolls-0
[8] https://nia.businesstowork.com/content/library-0
[9] http://www.abhilekh-patal.in/jspui/