Official publications released by the U.S. Census Bureau have a report number and often list the lead author(s).
Family Income Up 8 Percent Since 1955 (Advance data)
Number of families by family income and distribution of families and unrelated individuals by total money income, United States, urban and rural, 1952 to 1956.
Income of Men at All-Time High in 1956 (Advance data)
Advance figures on distribution of persons 14 years of age and over by total money income, by sex, for the United States, farm, nonfarm, 1956, 1955, and 1945.