1. ILO 1980 Classification of radiographs of the pneumoconioses. Geneva, Switzerland: Occupational Safety and Health Service, International Labor Office, publication 22, revised.
2. Specifications for medical examinations of underground coal miners: Chest roentgenographic examinations. 35 FR 42, chapter 1, subchapter C, 19 August 1970.
3. Proficiency examination of physicians classifying pneumoconiosis chest films;Morgan;AJR Am J Roentgenol,1979
4. 29 CFR, subtitle B, chapter XVII, part 1910, appendix E, 1999.
5. Hitt G. Asbestos makers litigants: uneasy victims. Wall Street Journal, 28 May 2002, p. A4; Sidel R, Warren S. Liabilities may trail asbestos spin offs. 29 May 2002, p. A1.