- Waterproof - Tear-Resistant - Topographic MapNational Geographic\'s Map Guide of the John Muir Trail is an indispensable tool for navigating one of the most famous trails in the United States.
Expert.... - Waterproof - Tear-Resistant - Topographic MapNational Geographic\'s Map Guide of the John Muir Trail is an indispensable tool for navigating one of the most famous trails in the United States