Editorial note — Chapter IV · ToC

[A] In classifying these occupations, some departure has been made from the Federal Census arrangement. Those engaged in Public Service have been separated from Domestic and Personal Service, while Trade and Transportation are tabulated separately; a few occupations have been put in an unclassified list, while one or two occupations are included that might possibly be regarded as professional. This rearrangement, however, does not prevent comparison with previous Federal Census classification, and it is hoped that it is in line with subsequent classifications.