Need Information on Citrus Trees

Does anyone know where I can find a guide that shows citrus trees listed and how cold it gets before it will harm them?

here is citrus species profile, [Only Registered Users Can See Links. Click Here To Register...]

Most of the online guides for citrus danger zone temps are geared for in ground planting and for only short periods of time. It also depends on the age of the tree in question. Older trees can survive better than younger one's. I would be very careful when going by those guidelines if your not in a citrus "safe zone".
Andi