Training materials
Authors: Hadley Wickham
and Contributors: Björn Grüning or Coline Royaux or Hadley Wickham or Janick Mathys or Markus Englund or Vitor Sousa
Authors: Hadley Wickham
and Contributors: Björn Grüning or Coline Royaux or Hadley Wickham or Janick Mathys or Markus Englund or Vitor Sousa