1. On the internal administration of nitrate of silver, and on the occurrence of a blue line upon the gums as the earliest sign of argyria Author(s): Pepper, William, 1843-1898, author Publication: [Philadelphia?] : [publisher not identified], [1877?] Subject(s): Silver Nitrate -- therapeutic useSilver Nitrate -- administration & dosageAdministration, OralArgyria -- etiologyGingiva