How to access older CAG reports related to the irrigation sector?

I am currently interested in examining the performance of irrigation projects....esp. as assessed by the CAG (Comptroller and Auditor General).
 In the CAG website, only the Union reports from 2002 to 2007 are available and among these, only the 2004 report refers to the irrigation sector.

Would someone know where the older CAG reports, from the 1990's and earlier are available  ? As I am based close to Bangalore, if there is some way to obtain a copy of the reports in Bangalore, it would be a great help.

Chitra Krishnan