Microfilm. 1928-1931. [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 44, no. 1]. 1930 p. 330 table with small amount of text obsurred in binding; 1931 lacking p.244-245,384-385. Filmed with : Geschäftsbericht des Verbandes der Bergarbeiter Deutschlands (1913/1914) / Verband der Bergarbeiter Deutschlands.