RT Journal Article SR Electronic T1 Further Observations on the Pathology of Pulmonary Emphysema in Chronic Bronchitics JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 58 OP 70 DO 10.1136/thx.14.1.58 VO 14 IS 1 A1 Brian E. Heard YR 1959 UL http://thorax.bmj.com/content/14/1/58.abstract AB