Hans Reiche wrote a lot about Canadian stamps. If you check the BNAPS Horace Harrison online library, you will find many of his articles in past issues of TOPICS.
http://www.bnaps.org/topics.phpRichard Morris published a book with Admiral shades using colour chips. A great reference if you can find one for sale (I have one myself).
You should also look for the BNAPs published Admiral Exhibit by Richard Morris. You can order one from Ian Kimmerly Stamps. It also has great info.