IS : 2185 (Part I) – 1979 (Reaffirmed 1987) (Reaffirmed 1998).
Indian Standard Specification for Concrete Masonry Units
Part I Hollow and Solid Concrete Blocks “Second Revision” Third Reprint.
Download Code : IS 2185 PART 1 – 1979 Concrete Masonary blocks Hollow and Solid (1998)