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I am a rock
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I am a rockI am a rock

First-person riddles present information about various rocks and minerals, including sandstone, chalk, slate, and petrified wood.

REUPLOAD NEEDED

 
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Tags: sandstone, including, chalk, slate, petrified, NEEDED
The History of Money: From Sandstone to Cyberspace The History of Money
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The History of Money: From Sandstone to Cyberspace The History of MoneyThe History of Money: From Sandstone to Cyberspace The History of Money

In his most widely appealing book yet, one of today's leading authors of popular anthropology looks at the intriguing history and peculiar nature of money, tracing our relationship with it from the time when primitive men exchanged cowrie shells to the imminent arrival of the all-purpose electronic cash card.
 
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Tags: History, Money, shells, cowrie, primitive, Cyberspace, Sandstone