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2. “Spontaneous Pneumothorax in College Students,”;Blackford;Journal A.M.A.,1939
3. “Genesis and Treatment of Spontaneous Pneumothorax,”;Bock;Deutsches Tuberkulose Blatt,1938
4. “A Simple Method of Controlling a Valvular Pneumoth.”;Boland;The Lancet,1934
5. “Spontaneous Pneumothorax,”;Ehrlich;Radiology,1938