Below is a breif overview from Bunny Mad! magazine. Issue 27 Spring 2017. Page 14-16. Currently it's not available in the US and many other countries, but Bunny Creations does ship worldwide.
"Through her own experience with Megacolon, Dani Tomlin helps us to understand this very serious condition and how we can tackle it."
"Why you need to know about this condition that affects many rabbits."
Some of the topics covered:
What causes genetic Megacolon?
Peculiarities in rabbits
Caring for your rabbits
Parasites and infections
A treatment plan
You can read the full article in the current issue. You can purchase it at: The Bunny Creations Store (worldwide shipping) and any Pets At Home (in the UK).