The majority of George Whalley's letters and papers can be found in the Queen's University Archives. Documents related to his more than 30 years of work on the marginalia of Samuel Taylor Coleridge can be found in the special collections of the E.J. Pratt Library in the Victoria University Library at the University of Toronto. Below are links to the archives at both institutions.
Victoria University Library Special Collections: Collected Works of Samuel Taylor Coleridge Fonds 58- Series 2