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keyword: thema EDItEUR::P Mathematics and Science::PG Astronomy, space and time::PGS Solar system: the Sun and planets – 0 free books.

-doab These books do not seem to be included in the Directory of Open Access Books.

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There aren't any German works in this list. Why don't you add some? Use the "More" tab on a work, there are links there for adding ebooks.