Received from Ottmar Bergmann & Rainer Wieczorek, Germany, Sweden

Envelope (front)

Envelope (back)

Mailart project "Widerständigkeit als Pflicht"

More info (in German) at: http://www.rainerwieczorek.de/

Mailart call "Arbeitswelten / Working worlds"

"Das schwarze Gold, Hommage an / to Harry Martinson"

Click on the image to enlarge.