Cymerwch 30 : arweiniad ymarferol i gerdded er mwyn gwella iechyd eich corff a'ch meddwl gyda chymorth elusen gerdded fwyaf Prydain = Take 30 : a practical guide to walking to improve health and well . Published by Cymdeithas y Cerddwyr in 2006. Publication and catalogue information, links to buy online and reader comments.