Goddesses specifically found in the Low Countries

I'm a student at the University of Pisa , in Italy .
While searching for material (at the KB in Den Haag) in order to begin to write my dissertation about Germanic goddesses specifically found in the Low Countries , I have been suggested by the librarian to contact the Meertens Instituut for a more appropriate help..but I haven't got any answer yet.
The point is I have to consider the subject from a philological point of view.
I was wondering how I could find detailed information (without any limitation concerning the language used) about the Germanic goddesses who have been found within the territory of the Netherlands and/or the Dutch speaking part of Belgium, and about female magic figures of that kind.
Anyone can help me?
While searching for material (at the KB in Den Haag) in order to begin to write my dissertation about Germanic goddesses specifically found in the Low Countries , I have been suggested by the librarian to contact the Meertens Instituut for a more appropriate help..but I haven't got any answer yet.
The point is I have to consider the subject from a philological point of view.
I was wondering how I could find detailed information (without any limitation concerning the language used) about the Germanic goddesses who have been found within the territory of the Netherlands and/or the Dutch speaking part of Belgium, and about female magic figures of that kind.
Anyone can help me?