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Boeken
David Levy's Guide To Observing And Discovering Comets
David Levy has held a lifelong passion for comets and is one of the mostsuccessful comet discoverers in history. In this book he describes theobserving techn... »
David Levy has held a lifelong passion for comets and is one of the mostsuccessful comet discoverers in history. In this book he describes theobserving techn... »
David Levy's Guide To Variable Stars
In this highly accessible book David Levy teaches the reader how variable stars work, and how to observe them. »
In this highly accessible book David Levy teaches the reader how variable stars work, and how to observe them. »
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