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- 29004831 contributor B728710.
- 29004831 created "1916.".
- 29004831 date "1916".
- 29004831 date "1916.".
- 29004831 dateCopyrighted "1916.".
- 29004831 extent "56 p. ;".
- 29004831 issued "1916".
- 29004831 issued "1916.".
- 29004831 language "spa".
- 29004831 publisher "Madrid : Impr. de F. Peña Cruz,".
- 29004831 subject "Fatigue.".
- 29004831 subject "HD4901 .C27".
- 29004831 subject "Hours of labor.".
- 29004831 subject "Labor economics.".
- 29004831 title "Notas para un estudio sobre la naturaleza económica del trabajo ...".
- 29004831 type "text".