This book has basic contact information for the trades and technical skills including apprenticeship programs and job websites. I cover community colleges and vocational schools in book #2.
The trades are really big because they're always there regardless of what high-tech industries come and go.
Whenever I go jogging, I always see the plumbing trucks, the electrical trucks, the contractor trucks, the carpet cleaners, window installers, etc. No matter what happens, people always need those basic services.
I looked around for an indepth vocational-trades book. I couldn't find one. Here is my attempt at a good comprehensive vocational trades book.
Even in the trades, be very wary about what you decide to go to school for. I've had friends spend a few years taking a certain vocational program like electronic technician or computer tech only to end up not being able to find a job in their field.