How Did We Find Out About The Universe?
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About This Book
Part of the "How Did We Find Out About...?" series. This series on the history of scientific discovery for grades 5-8 thoroughly explores the steps that led up to our present knowledge of familiar scientific subjects.
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!['X' Stands for Unknown [17 essays]](https://covers.openlibrary.org/b/id/7145555-L.jpg)
