I’m a big fan of field guides with colorful range maps, like the Peterson Field guides. I’m not sure where you’re located, but they have one for eastern trees and one for western.

If you prefer to use online sources – state/provincial government department of natural resources websites will often publish good information and local species lists.

You can even do a standard google search using terms like – “Red Pine” range map, and it’s amazing how much information you’ll find.

Great question!
– Brian