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© 1974 American Institute of Physics.
1974
American Institute of Physics
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Louis Berman, E. v. P. Smith, K. C. Jacobs, Carl Sagan; Exploring the Cosmos and Introductory Astronomy and Astrophysics. Physics Today 1 July 1974; 27 (7): 45–47. https://doi.org/10.1063/1.3128694
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