Thrasher Presents: How to Build Skateboard Ramps, Halfpipes, Boxes, Bowls and More (Skate My Friend, Skate): Thatcher, Kevin: 9780965727143: Amazon.com: Books
How to Build a Halfpipe or Ramp (with Pictures) - wikiHow
Ramp Plans
THRASHER - 80's ramp plans -- (jpg intensive) | Mountain Bike Reviews Forum