title: Astronomy: More medieval clues to cosmic-ray event.
authors: Gary W
authors: GW
authors: Gibbons
authors: Marcus C
authors: MC
authors: Werner
mesh_terms: D002247:Carbon Isotopes / Q000032:analysis*; D028203:Cedrus / Q000737:chemistry*; D003359:Cosmic Radiation
chemical_list: D002247:Carbon Isotopes