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![Cover for Manfred “dutch” Von Ehrenfried · Stratospheric Balloons: Science and Commerce at the Edge of Space - Springer Praxis Books (Paperback Book) [1st ed. 2021 edition] (2021)](https://imusic.b-cdn.net/images/item/original/296/9783030681296.jpg?manfred-dutch-von-ehrenfried-2021-stratospheric-balloons-science-and-commerce-at-the-edge-of-space-springer-praxis-books-paperback-book&class=scaled&v=1614519991)
![Cover for Manfred “dutch” Von Ehrenfried · The Artemis Lunar Program: Returning People to the Moon - Springer Praxis Books (Paperback Book) [2020 edition] (2020)](https://imusic.b-cdn.net/images/item/original/125/9783030385125.jpg?manfred-dutch-von-ehrenfried-2020-the-artemis-lunar-program-returning-people-to-the-moon-springer-praxis-books-paperback-book&class=scaled&v=1603986297)