Prepared by the Commonwealth of Pennsylvania, Department of Public Instruction, Division of Industrial Education and the Sun Shipbuilding and Dry Dock Company, Chester, Pennsylvania ; in cooperation with United States Office of Education, Federal Security Agency and School District, City of Chester, Cester, Pennsylvania

Commonwealth of Pennsylvania, Department of Public Instruction 1941

Available at 2 libraries

Prepared by the Commonwealth of Pennsylvania, Department of Public Instruction, Division of Industrial Education and the Sun Shipbuilding and Dry Dock Company, Chester, Pennsylvania ; in cooperation with United States Office of Education, Federal Security Agency and School District, City of Chester, Cester, Pennsylvania

Available at 1 libraries

by Robert W. Hambrook

United States Department of the Interior, Office of Education : United States Government Printing Office 1936 Vocational education bulletin no. 185 , Trade and industrial series no. 53

Available at 2 libraries

United States Department of the Interior, Office of Education : United States Government Printing Office

U.S. Department of Health, Education, and Welfare, Office of Education

G.P.O.

U.S. Dept. of Health, Education, and Welfare, Office of Education

United States Government Printing Office

Department of the Interior, Bureau of Education

G.P.O.

U.S. Department of Health, Education, and Welfare, Office of Education

U.S. Dept. of Health, Education, and Welfare, Office of Education