Howard, P Acute exacerbations and the fall of FEV 0.75 in chronic obstructive airways disease. [electronic resource] - Aspen Emphysema Conference 1967 - 481-9 p. digital Publication Type: Journal Article Subjects--Topical Terms: Asthma--complicationsBronchitis--complicationsChronic DiseaseFemaleHumansMaleMiddle AgedPulmonary Emphysema--complicationsRespiratory Insufficiency--etiologySeasonsSmoking--complicationsSpirometry