NOTES: Articles on fractional-count basis, i.e., for articles with collaborating U.S. and foreign institutions, United States receives fractional credit on basis of proportion of its participating institutions. Fields ranked by 1996–2003 growth rate. Social/behavioral sciences consist of psychology, social sciences, health sciences, and professional fields. Engineering/technology includes computer sciences. Biology includes agricultural sciences.

SOURCES: Thomson ISI, Science Citation Index and Social Sciences Citation Index, http://www.isinet.com/products/citation/; ipIQ, Inc.; and National Science Foundation, Division of Science Resources Statistics, special tabulations.