title: Challenges with the use of normal ranges in environmental monitoring.
authors.affiliation: Kilgour & Associates, Ltd., Ottawa, Ontario, Canada.
authors.forename: Bruce W
authors.initials: BW
authors.lastname: Kilgour
authors.affiliation: Kilgour & Associates, Ltd., Ottawa, Ontario, Canada.|University of Toronto, Toronto, Ontario, Canada.
authors.forename: Keith M
authors.initials: KM
authors.lastname: Somers