This map contains elements from previous maps; most specifically, the cartouche is copied from De Vaugondy's 1755 map of Canada. The map is hand coloured with the colours showing the British and French possessions of the area covered. The atlas this map is from was published between 1776 and 1784. Sources consulted do not specify which printing this map is from although as the 1st state it was earlier, rather than later in this period.
The 1836 publication of this atlas was the 1st edition. Virtually identical maps, with the exception of the publication information, appear in subsequent editions and atlases by Mitchell and others. The publication statement and the color palette definitively tie this to the 1836 publication.
While this is most likely from the 1838 edition of Bradford's atlas and Walter's notes indicate that, the color palette doesn't match other copies available online that are defintely from that atlas. However, the colors also vary between those maps.
Different sources have different publication dates for this atlas. The Library of Congress uses information from the supplementary index to date it to 1843. This is a fine steel engraving typical of Archer's work.
There are several interesting notes on the founding of the various English settlements covered by the map. The accompanying magazine article points out that the purpose of the map is illustrate the "just" claims of Great Britain and the "encroachments" of the French.
The map includes numerous notations giving the reader some historical and environmental context. Examples of these are: "The climate of this land is a great deal more temperate than Hudsons Bay" for an area in western Ontario north of the Lake of the Woods and "Christian Sea discovered by Jn Monk in 1619" on Baffin Bay.
The counties appear to be divided into townships or other geopolitical districts. In general, the use of townships had disappeared by the early 20th century, although some grew into towns and others are still used by locals. It's interesting that the Îles-de-la-Madeleine or Magdalin Islands are included as an inset on this map; they have never been part of Nova Scotia.