The Cenozoic Era
Britannica Educational Publishing
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The Mesozoic Era
Britannica Educational Publishing
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Geochronology, Dating, and Precambrian Time
Britannica Educational Publishing
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The Paleozoic Era
Britannica Educational Publishing
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Rats, Bats, and Xenarthrans
Britannica Educational Publishing
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Reptiles and Amphibians
Britannica Educational Publishing
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