Não informado. (1950). Bibliographical Series. Department of Mines and Technical Surveys.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bibliographical Series. Ottawa: Department of Mines and Technical Surveys, 1950.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bibliographical Series. Department of Mines and Technical Surveys, 1950.
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