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美国政府科技报告
>Absolute photometry of the light of the night sky - the zenith intensity of haleakala /latitude n. 20.7 deg/ and at fritz peak /latitude n. 39.9 deg/
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Absolute photometry of the light of the night sky - the zenith intensity of haleakala /latitude n. 20.7 deg/ and at fritz peak /latitude n. 39.9 deg/