StoneR. W.: Magnitude for the Problem, Arch Environ Health6:306, 1963.
2.
USPHS Publication, 1715, 1967.
3.
PettyT. L., NettL. M., FiniganM. M., BrinkG. A., and CorselloP. R.: A Comprehensive Care Program for Chronic Airway Obstruction, Ann Int Med70:1109, 1969.
4.
Management of Chronic Obstructive Lung Diseases, (Conclusion of the Eighth Aspen Emphysema Conference), USPHS Publication1457, 1966.
5.
Current Research in Chronic Airways Obstruction (Ninth Aspen Emphysema Conference), USPHS Publication1717, 1968.