1. National Research Council,Toward Safer Underground Coal Mines (Washington, D.C.: National Academy Press, 1982), p. 10.
2. See, for example, Connerton, M. M., “Accident Control Through Regulation: The 1969 Coal Mine Health and Safety Act Experience,” unpublished dissertation (Boston, Massachusetts: Harvard University, 1978), p. 29.
3. See Appleton, W. C. and Baker, J. G., “The Effects of Unionization on Safety in Bituminous Deep Mines,”Journal of Labor Research, vol. 5, no. 1 (Spring 1984), pp. 139–47;
4. Boden, L., “Underground Coal Mine Accidents and Government Enforcement of Safety Regulation,” unpublished dissertation (Boston, Massachusetts: MIT, 1976);
5. Connerton, M. M., “Accident Control Through Regulation”; and National Research Council,Towards Safer Underground Coal Mines.