Technology on the Frontier: Mining in Old Ontario by Dianne Newell, Vancouver, University of British Columbia Press, 1986. Pp 220; Bushworkers and Bosses: Logging in Northern Ontario, 1900-1980 by Ian Radforth, Toronto, University of Toronto Press, 1987. Pp xxxi + 336. Athabasca Oil Sands, Northern Resource Exploration 1875-1951 by Barry Glen Ferguson, Regina, Canadian Plains Research Centre/Alberta Culture, 1985. Pp vi + 283.