title: Shadows.
authors.forename: F S
authors.initials: FS
authors.lastname: Grebbell
mesh_terms: D004501:Education, Medical / Q000266:history; D005060:Europe; D049672:History, 19th Century; D049673:History, 20th Century; D011871:Radiology / Q000193:education / Q000266:history*; D014481:United States; D014965:X-Rays / Q000266:history