There is one on page 150, pertaining to Dominion notes before 1911.
Another on page 155 covers Dominion notes from 1911 to 1917, excepting the Train notes, covered on page 160.
Reduced premiums for 1923-25 notes on page 176.
These are all for Dominion notes, which are not often available in Choice or Gem Unc.
The percentages are probably suggested estimates only, and some negotiation might be needed to close a deal.
For all Bank of Canada notes there are columns for Choice and Gem in the pricing tables. No percentage calculations are required. The fact that a 1937 $1,000 sold far over book means either the market has moved ahead, or somebody got a bit carried away.