For a pocket version, I like the Emergency Medicine Manual by Ma and Cline. If you're truly out on your own with no other resources, I'd also be sure to have a procedure guide (I have Roberts and Hedges), a full reference (Tintinalli or Rosens) and an atlas.
This is assuming you're setting up shop somewhere with no other access to information. Otherwise, I'd just go with the pocket manual and a Tarascon's.
Take care,
Jeff