The entries from the archives (references) are now captured in an Excel sheet (for the future planned in a database) in which the following is recorded:

Region From which region is the reference, see also the description at the submenu option:
–          PR  A 2-letter abbrevation for one of the provinces
–          BE  Belgium
–          DL  Germany
–          RR  Holy Roman Emperor
–          XX  Country (mainly Latvia, Dutch Indies, USA)
From what
The full name (or names) of the concerned Van Dorsten (Van Dorssen, Dorst)
As specific as possible a date or year or period
The specific place or location where the reference is set
A shortened essential description what it is about, preferably one line
The source from which the information has been extracted
The exact and detailed text (as far as can be found back)
Van Dorsten