Various occupations in the iron and steel industry : B-636 and B-642 through B-648, or S-356 and S-362 through S-368.
United States.Bureau of Employment Security.
Pennsylavania State Employment Service.
Washington : Dept. of Labour,
1966.
Published by U.S. Employment Service in co-operation with Pennsylvania State Employment Service.
"United States Employment Service Technical Report."