Sersheim – Geschichte und Geschichten 792 – 1992, is a book by Christina Specht, from 1992. It is now out of print, un-digitized, and only available second hand shops. I’ve translated portions of it.
All Dutch era maps of Manhattan record the names of men. I found Margrietge’s farm by geolocating the men named in her deed as neighbors. Her farm was across the road from the New York Stock Exchange.