HAYS, D M Radiopaque grass heads in the lung. [electronic resource] - Diseases of the chest Jan 1958 - 38-42 p. digital Publication Type: Journal Article ISSN: 0096-0217 Standard No.: 10.1378/chest.33.1.38 doi Subjects--Topical Terms: Foreign BodiesHeadHumansLungLung DiseasesPoaceae