Potrebbe anche interessarti
https://www.mtb-mag.com/tbs-trail-building-school-imparare-a-costruire-trail/
http://www.4actionsport.it/mtb/2016/01/05/40288/
https://agendadegliappunti.wordpress.com/2019/03/07/al-ciocco-per-imparare-come-realizzare-sentieri-per-mountain-bike-con-imba-trail-building-school/