They point out that the majority of books about Paul Bunyan are composed almost entirely of elements with no basis in folklore, especially those targeted at juvenile audiences. Modern commercial writers are credited with setting Paul Bunyan on his rise to a nationally recognized figure, but this ignores the historical roots of the character in logging camps and forest industries. At the same time, several authors have come forward to propose that the legend of Paul Bunyan was based on a real person. D. Laurence Rogers and others have suggested a possible connection between Paul Bunyan tales and the exploits of French-Canadian lumberjack Fabian "Saginaw Joe" Fournier (1845–1875). From 1865 to 1875, Fournier worked for the H. M. Loud Company in the Grayling, Michigan area. James Stevens in his 1925 book Paul Bunyan makes another unverified claim that Paul Bunyan was a soldier in the Papineau Rebellion named Paul Bon Jean, and this is occasionally repeated in other accounts. Stewart and Watt acknowledge that they have not yet succeeded in definitively finding out whether Bunyan was based on an actual person or was wholly mythical. They have noted, however, that some of the older lumberjacks whom they interviewed claimed to have known him or members of his crew, and the supposed location of his grave was actually pointed out in northern Minnesota. Bunyan's extreme gigantism was a later invention, and early stories either do not mention it or, as in the Stewart and Watt paper, refer to him as being about seven feet tall. Included in this section is a comparison chart between early Paul Bunyan references, the Stewart and Watt paper, and the Laughead advertisement. In popular culture William Laughead's 1916 ad campaign for the Red River Lumber Company launched Paul Bunyan toward national fame, and established his marketing appeal which continues into the 21st century. Throughout the better part of the 20th century, Paul Bunyan's name and image continued to be used to promote various products, cities, and services. Across North America, giant statues of Paul Bunyan were erected to promote local businesses and tourism. A significant portion of these were produced from the 1960s through the 1970s by the company International Fiberglass as part of their "muffler man" series of giant fiberglass sculptures. Since 2014 a paved biking trail bears the name "Paul Bunyan Trail" and spans 120 miles, from Crow Wing State Park to Lake Bemidji