First off, I'd like to thank everyone for being so supportive during this mess. It makes things so much easier to deal with. THANK YOU ALL!
I've taken the time to go through the recipes in the book and list the title, source, first few ingredients, and when possible where the recipe was copied from. I've compiled this into a spreadsheet that can be downloaded from the website. I've only managed to get through the first 136 recipes so far and will be adding to it as time allows. [Update: the file now contains all 283 recipes]
So far what I've found is that the recipes were culled from a wide range of websites. The greatest number so far are from my own, but that's probably due to the fact that I can spot my own recipes much easier than someone else's. Here are the numbers:
19 - http://medievalcookery.com/
6 - http://www.godecookery.com/
4 - http://greneboke.com/
3 - http://www.pbm.com/~lindahl
2 - http://www.florilegium.org/
1 - http://www.hrp.org.uk/
If you happen to identify where any of the remaining recipes came from, let me know and I'll update the spreadsheet. Note that a preview version of the book is available online at Google books. Not all the content is there, but enough of the recipes are to be useful.