found on Google Books: freely available
https://play.google.com/store/books/details?id=2lphAAAAcAAJ&amp...
contains the Latin text of many medieval documents, and a translation into 18th-century Dutch
something remarkable I found already when I started to browse this book
Louis II, 'The German', King of the East Franks donated to a count Dirk (apparently nephew of his wife Emma of Altdorf) a forest named Wasda (somewhere in present-day Holland) on 13 april 869
this Dirk (Theodericus in Latin) could be the father of Graaf Gerolf II van Friesland