1. Occult blood testing for detection of asymptomatic colon cancer;Greegor;Cancer,1971
2. Occult blood testing for detection of asymptomatic colon cancer;Greegor,1970
3. The 1973 World Almanac and Book of Facts, New York;United States Population (Official Census),1972
4. The 1973 World Almanac and Book of Facts, New York;United States Population (Official Census),1972
5. Sensitivity and reproducibility of chemical tests for fecal occult blood, with an emphasis on false-positive reactions;Ostrow,1972