Kershaw, Linda, A. MacKinnon, and Jim Pojar. Plants of the Rocky Mountains. Edmonton: Lone Pine Pub., 1998. Print. Beidleman, Linda H., Richard G. Beidleman, Beatrice E. Willard, and Ruth Ashton Nelson. Plants of Rocky Mountain National Park: A Complete Revision of Ruth Ashton Nelson's Popular Manual. Helena, MT: Rocky Mountain Nature Association & Falcon Pub., 2000. Print. Last updated: February 24, 2015. Contact the Park. Mailing Address: Through winter, the Information Office is open 8:00 am–4:30 pm Mon–Fri. Recorded Trail Ridge Road status: (970) 586-1222.