Roller Derby
Links
| Lesson #1: Duties, skills, and ethics — The Zen of... | https://roller-derby.frama.io/the-zen-of-reffing/duties_skills_and_ethics.html |
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| Roller Derby Stats & Rankings | Flat Track Stats | http://flattrackstats.com/ |
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| WFTDA Online Learning & Certification | https://learning.wftda.org/enrollments |
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