Legacy of the Mesopotamian wheel  

Galenet:
1- Kids Infobits

Websites:
http://inventors.about.com/science/inventors/library/inventors/blwheel.htm
http://itotd.com/articles/414/
http://library.thinkquest.org/C004203/science/science02.htm
http://kosmoi.com/Science/Physics/Machines/Wheel/
http://en.wikipedia.org/wiki/Wheel
http://www.ohtm.org/wheel.html
http://www.ask.com/
http://www.google.com/
http://www.yahoo.com
http://www.newyorkcarver.com/inventions3.htm
http://inventors.about.com/library/inventors/blwheelbarrow.htm
http://encarta.msn.com/encyclopedia_761570653_2____5/Pulley.html#s5
http://www.clock-museum.co.uk/smpage/smhist.htm
http://users.commspeed.net/k6xf/clock.htm
http://www.arcytech.org/java/clock/clock_history.html
http://www.windmillworld.com/
http://www.designboom.com/history/cart.html


Encyclopedias:
1- World Book
2- The new book of knowledge
3- Grolier International

Books:
1- The wheel and how it changed the world
2- Wheels, pulleys and levers
3- Wheels, wings and moving things
4- Rough, tough wheels