Porter, J. B., Durley, R. J., Stansfield, E., Denis, T. C., Brunton, S. L., De Hart, J. B., . . . Cameron, A. E. (1912). An investigation of the coals of Canada: With reference to their economic qualities. Government printing bureau.

Porter, John Bonsall, Richard John Durley, Edgar Stansfield, Theophile Constant Denis, Stopford Lauder Brunton, Joseph Bertram De Hart, Edward Eric Billington, and Alan Emerson Cameron. An Investigation of the Coals of Canada: With Reference to Their Economic Qualities. Ottawa: Government printing bureau, 1912.

Porter, John Bonsall, et al. An Investigation of the Coals of Canada: With Reference to Their Economic Qualities. Government printing bureau, 1912.