"Motorcycling Adventure Handbook by Chris Scott"
Actually, you should inquire about a new edition rumored to be in the works, which will have far more information about Central and South America than the old one.
As an alternative, just hang around here for a while, reading whatever comes up (and pasting it into a separate document when you find something relevant). ADVrider.com sometimes comes through as well. By the time you're ready to leave you'll have more information than have any hope of making actual use of.
Mark
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