[1] Queens Univ, Dept Geog & Nanning Queen, Mackintosh Corry Hall,Room E208, Kingston, ON K7L 3N6, Canada
[2] Univ Western Ontario, Social Sci Ctr, Dept Sociol, 1151 Richmond St, London, ON, Canada
[3] Univ Western Ontario, Social Sci Ctr, Dept Geog, 1151 Richmond St, Richmond, ON, Canada