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No digital objectLibrary / National Library CollectionsBalkwill, H R.Ottawa :Energy, Mines and Resources Canada,1977. [1977]
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No digital objectLibrary / National Library CollectionsBalkwill, H. R.Ottawa :Minister of Supply and Services Canada,1977. [1977]
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No digital objectLibrary / National Library CollectionsAquatic Toxicity WorkshopHalifax :Environmental Protection Service,1977. [1977]
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No digital objectLibrary / National Library CollectionsSymposium on Fenitrothion : the Long-Term Effects of its Use in Forest EcosystemsOttawa :National Research Council of Canada, Associate Committee on Scientific Criteria for Environmental Quality,1977. [1977]
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