Independent plans providing medical care and hospitalization insurance in 1949 in the United States; 1950 survey. (United States. Social Security Board. Bureau of Research and Statistics. Bureau memorandum ; no. 72)
Independent plans providing medical care and hospitalization insurance in 1949 in the United States; 1950 survey.
(United States. Social Security Board. Bureau of Research and Statistics. Bureau memorandum ; no. 72)