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1по Ginzberg, Eli, 1911-“...Conservation of Human Resources Project (Columbia University)...”
Опубликовано 1967
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2по Ginzberg, Eli, 1911-“...Conservation of Human Resources Project (Columbia University)...”
Опубликовано 1968
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3по Ginzberg, Eli, 1911-“...Conservation of Human Resources Project (Columbia University)...”
Опубликовано 1971
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4Государственный документ по Reubens, Beatrice G.“...Conservation of Human Resources Project (Columbia University)...”
Опубликовано 1981