21.   The principal author of the report is Luann Becker, a geochemist at the University of Washington.

22.   The principal author is Dr. Eric Lander of the Whitehead Institute in Cambridge, Mass.

23.   The principal author of the paper was Dr. Sileshi Semaw, an Ethiopian paleoanthropologist.

24.   The principal author of the plan, Rep. John Kasich of Ohio, held before Democrats a picture of his own, showing a row of babies.

25.   Thomas was the principal author of the Nature report on the polar ice caps.

26.   Unease about the certainty of that conclusion has been expressed by an amateur historian who has had a rival theory and by the principal author of the DNA study.

27.   Valderrama, a graduate student in anthropology, is the principal author of the new report, which appears in the December issue of the journal Chemical Ecology.

28.   Which brings us to the case of Rep. Lamar Smith, R-Texas, a principal author of the immigration law enacted last year.

29.   Ximena Valderrama, a graduate student in anthropology, is the principal author of the new report, which appears in the December issue of the journal Chemical Ecology.

30.   Zolopa was principal author of the study, the first representative analysis of TB and HIV infection in the homeless population of a major city.