Number 104 (Story #3), November 25, 1992 by Phillip F. Schewe and Ben Stein AMERICAN SCIENCE HAS A TRADE SURPLUS with the rest of the world when it comes to the transmission and impact of research papers as measured by citations in technical journals. According to the Institute for Scientific Information (ISI), U.S. articles had the highest rate of citations-per-paper in the world for the period 1987-91; the U.S. lead in citations was highest in the physics category. In this case the sample size of papers published by U.S. physics authors was 66,353, which represented a 26.8% share of all worldwide physics papers for the period. (Science Watch, Sept. 1992.)