Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Classification of occupations: the classification of occupations, with special reference to the United States and the proposed new classification for the thirteenth census report on occupations
Commentary. Productivity or Efficiency in Cuban Agriculture: The Question of Factor Intensity/Comentario. Productividad o eficiencia en la agricultura cubana: el problema del factor intensidad