Books

1. Comets (Let's-Read-and-Find-Out Science Book)
   

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2. Dynamics of Comets: Their Origin and Evolution (Astrophysics and Space Science Library)
   

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3. Philip's Astronomy Encyclopedia
   

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4. The Messier Album
   

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5. Early History of Cosmic Ray Studies : Personal reminiscences with old photographs (Astrophysics and Space Science Library)
   

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Books