Dozens of posts dealing with the Canadian Centennial definitive issue (1967
 - 1973) have been published in the nearly four years Postal History 
Corner has been on-line. The original post dealing with International Surface Printed Matter rates was published on June 12, 2010.  
Surface Printed Matter Rates Summary
1. To October 31, 1968
a) UPU destinations : 4 cents for the 1st two ounces
b) Preferred destinations : 3 cents for the 1st two ounces 
The
 preferential printed matter rate applied to the United States 
(territories and possessions), North, Central and South America, the 
West Indies and Spain. 
2. November 1, 1968 - June 30, 1971
a) UPU destinations : 6 cents for the 1st wo ounces
b) Preferred destinations : 5 cents for the 1st two ounces
3. From July 1, 1971
a) UPU destinations :  8 cents for the first two ounces
b) Preferred Destinations : 6 cents for the 1st two ounces 
1.  To October 1968
a) UPU destinations : 4 cents for the 1st two ounces
Switzerland
Montreal to Dietkon, December 4, 1967
4 cents international surface printed matter rate
Greece
Toronto to Greece, November 16, 1967
4 cents international surface printed matter rate
USSR
Montreal to Izhevsk, March 3. 1967
4 cents international surface printed matter rate
New Zealand
North Surrey to Auckland, November 23, 1967
4 cents international surface printed matter rate
Short paid 1 cent 
Great Britain
Calgary to Altingham, December 18, 1967
4 cents international printed matter rate
Unpaid 
British due 7p
Canadian Tax Fraction
 British Calculation
The British international letter rate was 9p.
7p postage due ( labels cancelled January 4, 1968)
b) Preferred destinations : 3 cents for the 1st two ounces 
The
 preferential printed matter rate applied to the United States 
(territories and possessions), North, Central and South America, the 
West Indies and Spain. 
 Brazil 
 Riviere-du-Loup to Sao Paulo, December 18, 1967
United States
 Montreal to Lake George, N.Y., April 15, 1968
 2.  November 1, 1968 to June 30, 1971
a) UPU destinations : 6 cents for the 1st two ounces
The international surface printed matter rate increased from 4 cents to 6 cents for the first two ounces on November 1, 1968. 
Egypt
Montreal to Alexandria, Egypt, November 29, 1968
6 cents UPU surface printed matter rate
Switzerland
Montreal to Dietikon, December 3, 1969
6 cents UPU surface printed matter rate
Sweden
Vancouver to Bandhagen, December 9, 1970
6 cents UPU surface printed matter rate
Short paid 1 cent
Canadian Due fraction 2/12 
Numerator 2c = Double the deficiency
Denominator 12c = International surface letter rate
Swedish postage due : 20 ore
Finland
Downsview to Hyryla, November 10, 1968
6 cents UPU surface printed matter rate
 Incorrect Tax fraction 2/10
The
 international letter rate had increased on November 1, 1968 from 10 
cents to 12 cents. The office which taxed this letter continued using 
the old handstamp. The addressee would have been charged 2/10 of the 
Finnish international letter rate as opposed to the correct 2/12.
b) Preferred destinations : 5 cents for the 1st two ounces 
United States
 
Montreal to Thompsonville, Ct., May 16, 1969
5 cents preferred  printed matter rate to the U.S.
 
3.  From July 1, 1971
a) UPU destinations : 8 cents for the 1st two ounces
Great Britain
 Cobourg to Petersfield, November 23, 1971
8 cents UPU surface printed matter rate
 New Westminster to Coventry, December 9, 1971
8 cents UPU surface printed matter rate
Short paid 1 cent 
2p was the British minimum postage due charge
 Italy
 Montreal to Fidenza, November 22, 1972
8 cents UPU surface printed matter rate
 Finland
Toronto to Turjankatu, November 18, 1973
8 cents UPU surface printed matter rate
Sweden
Canada
 Post Office mailed publicity stamp notices world-wide to such groups as
 postal agencies, government officials and philatelic publications. The 
notices were sent in first day covers. In most cases, the cachets were 
used exclusively by the Canada Post Office.
b) Preferred Destinations : 6 cents for the 1st two ounces
United States
 Halifax to Preoria Heights, August 20, 1973
6 cents preferred printed matter rate to the U.S.