Volume 18; Issue 72
1st April 1931
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Authors: D'arcy Power
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Authors: John P. Hosford
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Authors: E. D. Telford, John S. B. Stopford
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Authors: George E. Waugh
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Authors: James A. Jenkins
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Authors: L. Woodhouse Price, Arthur Jacobs
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Authors: E. S. J. King
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Authors: J. Paterson Ross
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Authors: J. C. Boileau Grant
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Authors: F. D. Ackman, Lawrence J. Rhea
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Authors: Arnold Alcock
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Authors: Cecil P. G. Wakeley
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Authors: H. G. G. Nelson
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Authors: S. J. H. Griffiths
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Authors: Lambert Rogers
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