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1by Weckerle, Ferdinand, 1899-### CRL customization ### ?> ### Add publisher and desc details ### ?>
Published 1930[S.l.] : F. Weckerle, 1930.xii, 192, 72 p. ; 21 cm. -
2by Schläfer, Helmut, 1914-### CRL customization ### ?> ### Add publisher and desc details ### ?>
Published 1938[S.l.] : H. Schläfer, 1938.87, xvi p. ; 22 cm.