Ysmygu tybaco, defnyddio canabis a defnyddio alcohol : arolwg o ymddygiad iechyd mewn plant oed ysgol (HBSC) /
Clements, Angela.
Gordon, Cathryn.
Harries, Launa.
Parry-Langdon, Nina.
Roberts, Chris.
Wales.Office of the Chief Medical Officer.Research and Evaluation Branch.
[Caerdydd] : Is-adran Hybu Iechyd, Swyddfa'r Prif Swyddog Meddygol, Llywodraeth Cynulliad Cymru,
[2004]
Teitl clawr = Cover title.
Welsh/English text inverted and bound back to back.
Drug abuse
Cannabis
Alcoholism
Tobacco habit