All-clear regarding the gas leak in the Graham Science Center GRSC in Ephraim.
The Wedge Product for Sophomore Calculus
Geometric Calculus by Hestenes
Overview of Goemetric Algebra in Physics
Imaginary Numbers are not Real: The Geometric Algebra of Spacetime [a good intro]
Thorough, careful and general [A postscript file]
Tony Smith's page
Roger Critchlow's page