Training materials
Authors: Hadley Wickham
and Contributors: Hadley Wickham or Marius van den Beek or Mikko Rautiainen or Stéphanie Robin or Vilem Ded or Vitor Sousa
Authors: Hadley Wickham
and Contributors: Hadley Wickham or Marius van den Beek or Mikko Rautiainen or Stéphanie Robin or Vilem Ded or Vitor Sousa