Under the heading "Heiteres aus dem Streikgebiet" ("Funny episodes from the strike action") this postcards pokes fun at the large number of children of the Catholic Polish immigrants to the Ruhr District (Ruhrgebiet).
"Heiteres aus dem Streikgebiet", postcard, 8,6 x 13,7 cm, Germany c. 1900, unknown artist, Oberhausen: Nickel Kunstverlag; source: with the kind permission of the Westfälisches Industriemuseum, Dortmund, WIM 1992/2316, http://www.lwl.org/LWL/Kultur/wim/portal/profil/Sammlung/schaetze/menschen/.