L`Engle, Madeleine, author
A swiftly tilting planet
Dell Publishing, 1978
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A swiftly tilting planet
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Moore, Patrick
The planet venus
Macmillan, 1958
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Who is responsible for our tilting pagodas?
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Ahrens, L.H., author
Distribution of the element in our planet
McGraw-Hill, 1965
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