Conor Pacific Environmental and Landcare Research Consulting Inc. Environmental Effects of Oil Sand Plant Emissions in Northeastern Alberta, Regional Effects of Acidifying Emissions: 1997 Annual Report - Aspen Site Selection, January 1999

BOVAR Environmental, Landcare Research Consulting Inc. and AGRA Earth Environmental Limited. Environmental Effects of Oil Sands Plant Emissions in Northeastern Alberta: Regional Effects of Acidifying Emissions - 1996 Annual Report, August 1997.

AMEC, Monitoring Long-term Effects of Acid Emissions on Soil and Vegetation in Jack Pine and Aspen Forests in Northeastern Alberta