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1Published 1996“...American Discovery Trail....”
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2Published 2001Subjects: “...Discoveries in science....”
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3Published 2002Subjects: “...Discoveries in science....”
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6Published 1998Government Document Microform Book
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8by Cooper, Stanley B.Subjects: “...Discovery Program. nasat...”
Published 2001
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9by Bents, David J.Subjects: “...Discoveries in geography Technological innovations History To 1500....”
Published 1990
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