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82. ----------------. [ARMSTRONG, E. F., AND HILDITCH, T. P.] Study of Catalytic Actions at Surfaces. IX. Action of Copper in Promoting the Activity of Nickel Catalyst. Proc. Roy. Soc. (London), vol. 102-A, 1922, pp. 27-32; Chem. Abs., vol. 17, 1923, pp. 233-234.