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- 60031835 contributor B1459383.
- 60031835 created "[1955]".
- 60031835 date "1955".
- 60031835 date "[1955]".
- 60031835 dateCopyrighted "[1955]".
- 60031835 extent "189 p. ;".
- 60031835 issued "1955".
- 60031835 issued "[1955]".
- 60031835 language "spa".
- 60031835 publisher "Madrid : Instituto Social León XIII,".
- 60031835 subject "HD4901 .T6".
- 60031835 subject "Labor economics.".
- 60031835 subject "Working class.".
- 60031835 title "Filosofía del trabajo.".
- 60031835 type "text".