Cody Townsend's "The FIFTY" all started with a book. A book that pays tribute to the most aesthetic, boldest, most iconic, and most 'classic' backcountry ski lines of North America.

In this interview with all of the authors of the book, "Fifty Classic Ski Descents of North America", Penn Newhard, Chris Davenport, and Art Burrows divulge how they picked the lines, what went into the creation of the book, and how it's standing the test of time.

To pick up your own copy, go to 50ClassicSkiDescents.com

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Line #1: Messner Couloir

Line #2: Mt. Superior

Line #3: Terminal Cancer

Line #4: Hypodermic Needle

Line #5: Mt. Currie

Line #6: Aemmer Couloir

Line #7: Joffre Peak

Line #8: The Sphinx

Line #9: Spearhead Traverse

Line #10: Giant Steps Couloir

Line #11: Grand Teton

Line #12: Landry Line

Line #13: Middle Teton

Line #14-15: North Maroon & Holy Cross Couloir

Line #16: Mt. Tukuhnikivatz

Line #17: Wilson Peak

Line #18-19: Meteorite Mountain & Pontoon Peak

Line #20: Watson Traverse

Line #21: Mt. Shasta

Line #22: Mt. Timpanogos

Line #23: Mt. Washington

Line #24: Mt. Shuksan

Line #25: McGown Peak

Line #26: The Sickle

Line #27: Mt. Moran

Line #28/29/30: Mt. Hood, Mt. Rainier, & El Dorado Peak