Potrebbe anche interessarti
http://www.4actionsport.it/mtb/2016/01/05/40288/
http://mountainbike.bicilive.it/menu/trail-builder/sondaggio-europeo-sulle-abitudini-dei-biker/
https://agendadegliappunti.wordpress.com/2019/03/07/al-ciocco-per-imparare-come-realizzare-sentieri-per-mountain-bike-con-imba-trail-building-school/
http://cycletimes.net/val-di-sole-to-host-imba-italia-trail-building-school/