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Keywords: SpectroscopyResearch 005.jpg Arc spectra of pure manganese center and of copper containing 0 1 percent manganese as recorded through a rotating stepped sector Wavelength range 3960 to 4105A National Institute of Standards and Technology 3/7/1961 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Spectroscopy |