SA7H Footnotes

1/ The estimates of wages and salaries for 1929-57 are based on the 1967 Standard Industrial Classification. For 1929-47, the wages and salaries estimates are assumed to be on a place-of-residence basis; explicit adjustments were made for the principal interstate commuting flows. For 1948-57 the estimates are on a place-of-work basis.
Geographic Note-- Estimates prior to 1950 are not available for Alaska and Hawaii.
Note-- All dollar estimates are in current dollars (not adjusted for inflation).
(L) Less than $50,000, but the estimates for this item are included in the totals.
(NA) Data not available for this year.
(NM) Not meaningful.
Last updated: May 30, 2014-- revised estimates for 1929-1957.