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Differential occupational Ability Patterns
Dvorak, Beatrice Jeanne, (1935)
The Duluth Casual Labor Group : Hansen, Alvin H[arvey] ; By Alvin H. Hansen, Marion R[ex] Trabue and Harold S[heely] Diehl
Hansen, Alvin H., (1932)
A manual of selected occupational tests for use in public employment offices
Green, Helen James, (1933)