Employment in the Great Depression: New Data and HypothesisJohn Joseph Wallis ,
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Explorations in Economic History
The traditional source of information on employment during the Great Depression is the BLS establishment sample, the foundation of Lebergott's employment and unemployment estimates. The sample was collected in detail sufficient to estimate total nonagricultural, manufacturing, and nonmanufacturing employment series at the state level for every year between 1930 and 1940.