. . . . . . "Efficiency of skilled workers on Works Progress Administration projects"@en . . . . . . . "The skill of brick and stone masons, carpenters, and painters employed on Works progress administration projects in seven cities in January, 1937"@en . . . "The skill of brick and stone masons, carpenters, and painters employed on Works Progress Administration projects in seven cities in January, 1937"@en . . . . . . . . . . . .