There are several important conference for injury biomechanics that may not be readily available online. Here's a summary of how to get the full text papers from these conferences.
AAAM (Association for the Advancement of Automotive Medicine):
Stapp Car Crash Journal / Stapp Car Crash Conference:
IRCOBI (International Research Council on the Biomechanics of Impact):
NHTSA ESV (Enhanced Safety Vehicles) are available online from 1971-present.
If UBC doesn't have access to the proceedings or technical paper you need, you can submit a request through Interlibrary Loan.