Which Topic in the Open Access Journals Bibliography Has the Most References?

Which topic in the Open Access Journals Bibliography has the most references? Interestingly enough, it's "Open Access Journal Research Studies."

Here's the bibliography's section list ranked by number of references.

1. Open Access Journal Research Studies
2. Open Access Journal Economic Issues
3. Open Access Journal Case Studies
4. Open Access Journal General Works
5. Open Access Journal Publishers and Archives
6. Open Access Journal Library Issues