Hi, BGScholar. That secondary sources page is mine. You should also check out a place called
The (Almost) Undeleted. There are a lot more resources there that you may find useful. As a matter of fact, in the upcoming weeks one user there is going to be updating a new list of scholarly assets about Herbert and Dune that will dwarf the secondary sources link.
There is also a mirror of the Secondary Sources link that is more up to date.
Who have you contacted? I actually have most of those dissertations, but several I have not put up because I dont have permission. If you have contact for a few of them, I'd appreciate it if you would give me that contact so I can get the necessary permissions.
I suppose as an admin here I should also warn you that engaged participation at any of these websites may upset the HLP, the body that manages Frank Herbert's literary estate. If you have any intention of contacting them for help, you likely should remain aloof from us. Of course, you will be welcomed with open arms should you decide to do that, then come home to us later. I would love to chew the fat with you about FH and your project, so please consider that a warning for your own good and not an attempt to chase you away. And if the circumstances were any different I would say that is unfortunate, but the sad fact is that most of us like it that way.
EDITED to color the link red so it is more visible.