APA Style
National Geographic, Washington, DC.. ().
The State of the Earth: contemporary geographic prespectives. .
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Chicago Style
National Geographic, Washington, DC..
The State of the Earth: contemporary geographic prespectives..
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MLA Style
National Geographic, Washington, DC..
The State of the Earth: contemporary geographic prespectives..
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Turabian Style
National Geographic, Washington, DC..
The State of the Earth: contemporary geographic prespectives..
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