00900cam a22002411 4500 l 31000062 DLC 20260227111533.0 790709s1930 sz i100 0 eng c l 31000062 (OCoLC)5151548 Library, U.S. Dept of Labor OCl DLC premarc HD5119.M6 I5 1930a International Labour Office. Hours of work in coal-mines. Item III on the agenda. Enquiry into the lignite industry in Europe. Survey of the replies of the governments. Geneva, International labour office, 1930. 88 p. 21 cm. At head of title: Report III. Supplement. International labour conference. Fourteenth session. Geneva, 1930. Hours of labor. Lignite. International labor conference (14th : 1930 : Geneva) 36013 36013