Have a look at this treasure-trove of data, compiled by many students of the subject and nurtured with great care by the Postal History Society of Canada:
http://www.postalhistorycanada.net/php/Duplex/And then, when you have what you need, I suggest a modest contribution to their coffers - memberships are a mere $15 per year for electronic access to the journal, etc.
Peter in Ottawa
Posted 02/28/2015 5:20 pm
