Unitrade Specialized Catalogue of Canadian Stamps that is.
Also, look on
ebay. Sounds simple and then cpomplex, but for listed varieties and errors and non-listed also,
ebay, BidStart, Delcampe sites are the best. Beats buying all the specialized catlogues and books.
You learn fast when you have to do some work yourself. Mark stuff down, numbers and stuff. Scott is US and Canada based catalogue. Stanley Gibbons (SG) is Breat Britain / Unuited Kingdom) based, with different numbers.
Also look at the them or subject of the stamp to help in searching. For older stamps, search by reigning monarch, KGV means King George the 5th, QEII, Queen Elizabeth the 2nd, and so on.
For nice info also look at the Stamp Of The World site:
http://www.stampsoftheworld.co.uk/w...of_the_WorldIf you get really confused ask on Stamp Community.