Firth, L. G. (1963). Canada: The Fifteen Cents of 1868.

A work of inestimable value to all serious collectors of this issue and specialists who are in search of a dependable guide through the maze of shades, perforation, plate varieties which characterize the 15 cent Large Queen. There are 54 illustrations of stamps in coloured plates which are as faithfully reproduced as the most modern of printing techniques will allow and this undoubtedly will be a major attraction. The re-entry in the ’15’ of the left value table and the ‘Canada P’ is most faithfully and painstakingly recorded together with the well known ‘3 dot’ plate variety.

Long study and considerable experience on the part of the author is reflected in the faultless manner in which he deals with the Montreal and Ottawa printings, types of paper used (and how to distinguish them), the different types of gum, the watermarks and perforation varieties. Indeed, nothing has been overlooked that is of any importance. For good measure two invaluable appendices give receipts from printers, stocks and issues to postmasters and notes on the nomenclature of colours and shades (Maerz & Paul colour code).

Ben Cohen, http://largequeens.com/