Postcard DE-5435211

If I ever visit the city of Oberhausen, the first thing I do is go to bookstore and buy all the postcards presenting this beautiful city.
And all capital of Landkreis of Nordrhein-Westfalen, i havent in my collection!!!;
Borken, Coesfeld, Düren, Schwelm, Essen, Hagen, Hamm, Heinsberg, Herford, Herne, Meschede, Höxter, Kleve, Lüdenscheid, Mettmann, Minden, Mönchengladbach, Mülheim an der Ruhr, Münster, Gummersbach, Oberhausen, Olpe, Paderborn, Recklinghausen, Remscheid, Bergheim, Bergisch Gladbach, Neuss, Siegburg, Siegen, Soest, Solingen, Steinfurt, Unna, Viersen, Warendorf and Wesel.

what I do in all my visits, that's why I have a lot of cards from Bordeaux, Toulouse and France, because I travel these cities, but Germany I did not visit this is why I ask your help.

my collection of postcards from Germany:
https://goo.gl/photos/CwbA35DBbqb3nEp78