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Hal Koerner's Field Guide to Ultrarunning: Training for an Ultramarathon, from 50K to 100 Miles and Beyond
Training Essentials for Ultrarunning- Second Edition
Relentless Forward Progress: A Guide to Running Ultramarathons
Hal Koerner's Field Guide to Ultrarunning: Training for an Ultramarathon, from 50K to 100 Mil
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