Research report
National Industrial Conference Board
National Industrial Conference Board c1923 Research report no. 62
Available at 3 libraries
National Industrial Conference Board c1923 Research report no. 60
National Industrial Conference Board c1923 Research report No. 56
Available at 4 libraries
The Century 1921 Research report No. 45
The Century 1921 Research report No. 43
Available at 7 libraries
National Industrial Conference Board c1918 Research report no. 6
Available at 6 libraries
