1. National Center for Health Statistics. Vital Health Stat Series No. 10, 1998; 193
2. Mortality patterns: preliminary data; United States–1996;Centers for Disease Control and Prevention;Morb Mortal Wkly Rep,1997
3. Strategies in preserving lung health and preventing COPD and associated diseases;National Lung Health Education Program (NLHEP);Chest,1998
4. The prevalence of chronic respiratory disease in a New Hampshire town;Ferris;Am Rev Respir Dis,1962