https://www.mtb-mag.com/tbs-trail-building-school-imparare-a-costruire-trail/
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http://www.4actionsport.it/mtb/2016/01/05/40288/
18/02/2015 IMBA Europe – http://www.imba-europe.org/events/trail-building-school-porretta-terme
01/09/2014 – SingleTrack Torino – Primo meeting IMBA Italia a Porretta Terme by Happy Trail
