BOOKQUE

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Cumulative Effects of Low Levels of SO2 on O3 Sensitivity in Bean and Cucumber
Gerald Hofstra , A. E. G. Tonneijck , James D. Holley
· 1982
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The Effects of Low Levels of SO2 on Plant Sensitivity to Ozone: Final Report. Phase III
Gerald Hofstra , University of Guelph. Department of Environmental Biology
· 1980
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The Effects of Sulphur as SO2 Or SO4: Final Report
Gerald Hofstra , University of Guelph. Department of Environmental Biology
· 1980
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Salt Damage to Roadside Plants
G. P. Lumis , G. (Gerald) Hofstra , R. (Robert) Hall , Ontario. Ministry of Agriculture and Food
· 1977
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Foliar Responses of Five Plant Species to Ozone and a Sulphur Dioxide/ozone Mixture After a Sulphur Dioxide Pre-exposure
Gerald Hofstra , David W. Beckerson , University of Guelph. Department of Environmental Biology
· 1980
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The Relationship Between Meteorological Conditions, Ozone Concentrations and Injury to White Beans Throughout Southwestern Ontario
T. J. Gillespie , Gerald Hofstra
· 1979
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The Effects of SO2 and Other Sulphur Forms on Plant Sensitivity to Ozone: Final Report
Gerald Hofstra , University of Guelph. Department of Environmental Biology
· 1980
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1976 Ozone Concentrations in Southern Ontario in Relation to Weather Factors : for Presentation to the Royal Commission on Electric Power Planning
G. (Gerald) Hofstra , A. P. Humphreys , D. P. Ormrod , Ontario. Royal Commission on Electric Power Planning
· 1977