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No digital objectLibrary / National Library CollectionsMcClelland, W. R.[Ottawa] :[Ministère des mines et des releves techniques],[1952] [1952]
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No digital objectLibrary / National Library Collections[Ottawa]: Directorate of Scientific Information Services,1952. [1952]
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No digital objectLibrary / National Library CollectionsOttawa: Defence Scientific Institute,1952. [1952]
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