Microfilm. 21. (1928). [Madison, Wis. : Collection Preservation Dept., Memorial Library, University of Wisconsin-Madison, 1983]. 1 microfilm reel : negative ; 35 mm. (Serial publications of German trade unions in the Memorial Library, University of Wisconsin-Madison). [German Trade Unions ; Reel 54, no. 6]. Filmed with : Jahrbuch der Innung: Bund der Bau-, Maurer- und Zimmermeister zu Berlin (v.16, 1926/1927) / Bund der Bau-, Maurer- und Zimmermeister zu Berlin.