1. Research and the ulcer problem;Blumenthal,1959
2. Mortality trends in the United States 1954–1963;Klebba;National Center for Health Statistics, Report Series 20,1966
3. Statistical abstract of the United States: 1964,1964
4. Statistical abstract of the United States: 1966,1966
5. Peptic ulcers reported in interviews, United States, July 1957–June 1959;Kovar;U. S. National Health Survey, Series B,1960