Cycles of unemployment in the United States, 1903-1922

por Berridge, William A.
Publicado 1923

Purchasing power of the consumer a statistical index

por Berridge, William A.
Publicado 1925

Employment statistics for the United States a plan for their national collection and a handbook of methods recommended by the Committee on Governmental Labor Statistics of the American Statistical Association

por American Statistical Association.
Publicado 1926