The Peddlers: The Fuller Brush Man, the Lords of Liniment and Door to Door Heroes in Nova Scotia and Beyond by Blain Henshaw

Mr. Henshaw's book, while of regional interest to Nova Scotians, will undoubtedly recall to mind travelling salesmen from your past as it did mine (if you are old enough!).  Furthermore, it does go beyond provincial borders to look at products such as Buckley's, Rawleigh's and Watkins that while developed elsewhere, were sold door-to-door in the Maritime region.