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Keywords: SpectroscopyResearch 015.jpg The comparison showed the extent to which absorption lines due to oxygen and water vapor in the earth's atmosphere are weakened at the altitude of the Mauna Loa observatory National Institute of Standards and Technology 1956-12-19 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Spectroscopy |