TY  - BOOK
ED  - United States.
TI  - Productivity of labor in merchant blast furnaces ..: December, 1928
T2  - Bulletin of the United States Bureau of labor statistics,
AV  - HD8051 .A62 no. 474
PY  - 1929///
CY  - Washington
PB  - U.S. Govt. print. off.
KW  - Blast furnaces
KW  - Labor productivity
N1  - At head of title:  U.S. Department of labor.  James J. Davis, secretary.  Bureau of labor statistics.  Ethelbert Stewart, commissioner; Issued also as House doc. no. 423, 70th Cong., 2d sess
ER  -