Training materials
Authors: Hadley Wickham
and Contributors: Anatole Chessel or Anna Syme or Derek Wright or Dr. Scooter Morris or Eija Korpelainen or Hadley Wickham
Authors: Hadley Wickham
and Contributors: Anatole Chessel or Anna Syme or Derek Wright or Dr. Scooter Morris or Eija Korpelainen or Hadley Wickham