Relation of sickness to income and income change in 10 surveyed communities : health and depression studies No. 1 ; method of study and general results for each locality
Relation of sickness to income and income change in 10 surveyed communities : health and depression studies No. 1 ; method of study and general results for each locality / by G. St. J. Perrott and Selwyn D. Collins.
Published
Washington, D.C. : United States Government Printing Office, 1935.