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The Toltecs and Maya developed wheels for religious reasons but not for wheelbarrows or other practical uses The reason is that they had sufficient slave labor

Shale oil: the next energy revolution

publication - International Energy Agency

All pages - Kavli Institute for the Physics and Mathematics of

13-16P

World disque - MARQUEE INC.

World disque - MARQUEE INC.

2. Your Opinions on Environmental Problems

Profiles of Faculty and Research Scholars

URBIO 2010 Proceedings
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