The building material industries of the Niagara Escarpment : a study of changing locational patterns Walker, John Henry. Book - 1965 LHC Wal Location Collection Call number Victoria Microfilm LHC Wal Available
Mineral aggregate study of the Central Ontario Planning Region Proctor and Redfern Ltd Book - 1974 LHC 338.2 Ont Location Collection Call number Victoria Acorn Room LHC 338.2 Ont Available