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The solar system, by W. W. Campbell. |
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What we know about comets, by W. W. Campbell. |
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A total eclipse of the sun, by R. G. Aitken. |
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The moon, by R. G. Aitken. |
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The nebulae, by H.D. Curtis. |
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Astronomical discovery, by H. D. Curtis. |
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The important epochs in the development of astronomy, by R. T. Crawford. |
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Our nearest star, the sun, by C. E. St. John. |
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News from the stars, by R. G. Aitken. |
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Recent progress in the study of the motions of bodies in the solar system, by A. O. Leuschner. |
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The brightness of the stars, their distribution, colors, and motions, by F. H. Seares. |
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The 100-inch reflecting telescope, Mount Wilson |
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