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3. Peddle, C. J., “British Glass-making Sands—the Substitution of Some British Sands for Foreign Sands in the Manufacture of High Grade Glass”, J. Soc. Glass Technol., 1, 27 (1917).
4. “Specification for Sands for Making Colourless Glass”, J. Soc. Glass Technol., 19, 26 (1935).
5. “Sands for Making Colourless Glasses, Revised Specification”, J. Soc. Glass Technol., 38, 41 (1954).