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History: Turn of 21st Century
As of mid-1990s, est. 25-30M ILL transactions flowing per year
In 119 major research libraries, this traffic is only 2% of library circulation (thus ~1.5B items circulate annually nationwide)
50% of OCLC (major system w/7M reqs/year) requests are for books
90% of public library requests are for books
2/3 of major research libraries’ requests for photocopies, half articles >= five years old
Jackson, M. CONFU Interlibrary Loan Working Group Summary of Discussions. Via web, March 27, 1996