Sample DITA end-user documentation?


I am a student in the Technical Communication program at Red River College in Winnipeg, Manitoba. As part of my graduation project,

I am exploring the prospect of using DITA to design an end-user guide to develop a web application for a cancer treatment centre in the province. Does anyone have a link to any substantial documentation samples that were designed using the DITA architecture? I was hoping to find.pdfs or Windows Help Files. 

Must appreciated.
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