If you are looking for a modern map, you were almost there.
http://mapblast.com/myblastd/ or http://www.mapblast.com/myblastd/
Select Germany as the country (the second box under the "Map" tab).
Click on "Create Map."
In the box titled "City, State, or Zip Code", type in Oldenburg, Jever, or
Then click on "Create Map."
Sometimes as in the case of Oldenburg, you get choices. Select the one you want.
Once you have the map you can zoom in or out, or print, or save it.
Hope this helps!
Marilyn Ruhe Wethington