1. Weights and Measures Act (GB), 1.878, 41 42 Vict., c. 49.
2. Weights and Measures Act. 11/12 Eliz. II Ch 31 (1963).
3. Nature (GB) 183, 80 (1959).
4. Thom, A., Megalithic Sites in Britain Chs. 5 and 7. (Oxford: University Press, 1967).
5. Baynes, A. W., J. Textile Inst. (GB) 48, 254 (1957)