e49177c8__Census_1840___Social_Explorer__Column_19
[Column 18] engineer [Column 18_2] lawyer [Column 19_3] general practice [Column 19] 
locomotive
Census Questionnaires and Instructions: 1790 to 2000 - Measuring America: The Decennial Censuses From 1790 to 2000 - Survey Census 1840 - Social Explorer