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© 1963 American Institute of Physics.
1963
American Institute of Physics
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W. A. Hiltner, Gerard P. Kuiper, Barbara M. Middlehurst, Cecilia Payne‐Gaposchkin; Astronomical Techniques. Physics Today 1 January 1963; 16 (1): 63. https://doi.org/10.1063/1.3050717
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