This recipe comes from the Lower Rhine Valley and has the characteristics of typical Northwest German Potato Salads, that is, a Mayonaise Base, but without other vegetables or pickles. It's made more interesting by the use of apple vinegar in the dressing.
Texas-German Potato Salad
This is a Potato Salad from a family cookbook from German Settlers in Texas, and features the hallmarks of North German potato salads with a Texas-twist.
Alsatian Potato Salad
Potato salad is a German innovation, likely from the early 19th century, though rooted in cooking traditions dating back to the beginning of the previous century. The recipe spread across Europe and the New World over the course of the 18th century. This particular recipe comes from Alsace, which at the time was predominantly German-speaking.