The National Christmas Seals of Canada, 1927-2008 by Cliff Beattie, Andrew Chung FRPSC, and Robert D. Vogel. This 119 page comb bound first edition is a specialized catalog and contains the best information on the subject.
Order from Andrew Chung, P.O.Box 89111, Westdale RPO, Hamilton, ON, L8S 4R5 The full color edition is $79.95 or black and white for $29.95 + shipping of $4 within Canada, $8 to USA, or $16 elsewhere.