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    6. The increase in total cost is largely attributable to an increase in estimated number of scientists who are active in research, teaching, and/or other endeavors that involve reading scholarly journals; i.e., 2.23 and 6.38 million scientists in 1975 and 1998 respectively. Estimates of number of scientists are inexact (see Science & Engineering Indicators-2000, p.3-3 to 3-5).

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