Wilderness Medical Associates makes some great outdoor-oriented ones (for Wilderness EMTs and first responders):

http://wildmed.com/Merchant2/merchant.mv...egory_Code=PUBS

I have that one and a small "WFR cheat sheet" downloaded from NOLS here:

http://www.nols.edu/wmi/pdf/wfr_cheat_sheet.pdf

WMA also makes a great, extensive spiral-bound first aid field manual.