14 . - delete ] Limit values for controlling emissions of NOx from new stationary sources in the following stationary source categories are specified in the following documents : ( a ) Coal-fired Utility Units -- 40 Code of Federal Regulations ( C.F.R . ) Part 7 ; ( b ) Electric Utility Steam Generating Units -- 40 C.F.R . Part 60 , Subpart D , and Subpart Da ;