Localized places could be overlay each other depending on the zoo m level. In this case the shadow of the symbol is darker and the individual place symbols will fold up by clicking upon. A click on an individual place symbol opens a popup providing a link to search for other references to this place in the database.
Gruen, Arno, Index entry in: Deutsche Biographie, https://www.deutsche-biographie.de/pnd115766855.html [14.06.2024].