About Douglas McCalla Douglas McCalla is University Professor Emeritus in the Department of History at the University of Guelph. Books by Douglas McCalla Consumers in the Bush Shopping in Rural Upper Canada by (author) Douglas McCalla The Upper Canada Trade 1834-1872 A Study of the Buchanans' Business by (author) Douglas McCalla The Upper Canada Trade 1834-1872 A Study of the Buchanans' Business by (author) Douglas McCalla