Sonya, that is a good explanation. Here is one from Memoria Press outlining the differences between the Greenleaf and MP versions –
What is the difference between the new Memoria Press Famous Men of the Middle Ages and the old Greenleaf edition?
The stories are essentially the same, but with our editing. In the Memoria Press Famous Men Series, we also have added Improved Images and a Glossary of People and Places.
The Baldwin Project online version, is, I believe, the original.