Dr. Ballard said earlier studies of seashells from the area helped to date the underwater coastline.
Earlier studies of other cancers usually placed the survival benefit in months.
Earlier studies of youthful romance tended to focus on its risks and those who were most vulnerable.
He and his colleagues said the problem may lie in how some earlier studies of sinusitis rates were conducted.
As in earlier studies of the 19th century, Bradley's approach focused largely on character.
Earlier studies of acupuncture as a treatment for cocaine dependency, one of the most difficult forms of drug addiction to combat, have emerged with mixed results.
Mr. Luken is appointing a commission on the disruption but says he does not want another detailed report to go with earlier studies of the city's racial division.
Earlier studies of pill use in women with family histories of breast cancer had conflicting results, with some showing an increased risk and others finding no effect.
The work on genetically modified plants was based in part on Dr. Wu's earlier studies of DNA sequencing in the 1970s.
The findings, being published today in The Archives of Internal Medicine, concern the use of estrogen alone and differ from earlier studies of estrogen and progesterone.
Unlike some earlier studies of the effects of road noise, they found no difference in the density of birds at both kinds of sites.
