Is there not something near the beginning in the small print of the various documents telling you who to get in contact with? I know there are in documents in the UK published by the CAA. For example, out of MATS 1:
"Enquiries regarding the content of this publication should be addressed to:
ATS Department, Safety Regulation Group, Civil Aviation Authority, Aviation House, Gatwick Airport South, West Sussex, RH6 0YR."
DF