Leave No Trace bouldering ethics: Transitioning from the gym to the crag
| Autor: | Schwartz, F., Taff, B.D., Lawhon, B., Pettebone, D., Esser, S., D’Antonio, A. |
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| Zdroj: | In Journal of Outdoor Recreation and Tourism March 2019 25:16-23 |
| Databáze: | ScienceDirect |
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