   Showing Off the Geltung Hypothesis (Hardcover) → Paperback ISBN-13: 9780292791022 ISBN-10: 029279102X Genres: Nonfiction, Science & Math ?  Showing Off the Geltung Hypothesis (Paperback) → Hardcover ISBN-13: 9780292791039 ISBN-10: 0292791038 Genres: Nonfiction, Science & Math ? |
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