I agree with previous assessments.
You can save yourself a lot of time and effort by:
Getting a Unitrade Catalog to look up the value of your stamps. (Some
Canada Post outlets have them for sale in the $40 range)
Check your local library's reference section
Hobby, Stamp and/or coin shops
The CV (Catalog Value) of most stamps in Unitrade changes little from year-to-year; so, a recent book is not necessary.
The price listed Is a bench-mark of sorts and reflects what you might expect to pay a dealer for a stamp.....NOT what a dealer will pay you for a stamp.
What prices collectors work with is usually half of CV +/- depending on condition and/or the collectors involved in the negotiations.
I suggest buying a recent catalog (for about $10) from a stamp collector or borrow this year's edition.
I would send you one for free; but
Canada Post would charge me at least $15 and that's beyond my generosity level.