Katahdin: the trees stop at 4,000 feet

References

1. 1
   Baxter State Park: Katahdin and Traveler Ridge trails closed for the season

   baxterstatepark.org

2. 2
   Kimball et al.: Understanding Northeastern US Alpine Mountains

   cdn.outdoors.org

3. 3
   Maine Natural Areas Program: Heath Alpine Ridge

   maine.gov

4. 4
   Maine Natural Areas Program: Alpine Snowbank

   maine.gov

5. 5
   Maine Department of Inland Fisheries and Wildlife: Katahdin Arctic

   maine.gov

6. 6
   Baxter State Park: Hiking

   baxterstatepark.org

7. 7
   Baxter State Park: Winter Basics

   baxterstatepark.org

8. 8
   Baxter State Park: History

   baxterstatepark.org

9. 9
   Maine Geological Survey: Alpine Glacial Features along the Chimney Pond Trail

   digitalmaine.com

10. 10
    Appalachian Trail Conservancy: A.T. Basics

    appalachiantrail.org