From an ARL Announcement:
The Association of Research Libraries (ARL) has published ARL Statistics 2009–2010, the latest in a series of annual publications that describe the collections, staffing, expenditures, and service activities of the 125 ARL member libraries in 2009–2010. Of these, 115 were university libraries (18 in Canada and 107 in the US); the remaining 10 were public, governmental, and nonprofit research libraries (2 in Canada, 8 in the US).
The total library expenditures of all 125 member libraries in 2009–2010 was slightly more than $4.2 billion; of that total, roughly $3.2 billion was spent by the 115 university libraries and slightly more than $990 million by the 10 nonuniversity libraries.
ARL has collected and published annual statistics for its member libraries since 1961–62, expanding upon the work of James Gerould, who collected this information first at the University of Minnesota and later at Princeton University. The data he collected, covering the years 1907–08 through 1961–62, are now called the Gerould Statistics. The complete data series from 1908 through the present represents the oldest, most comprehensive, continuing library statistical series in North America.
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The total library expenditures of all 124 member libraries in 2008–2009 was slightly more than $4 billion; of that total, roughly $3.1 billion was spent by the 114 university libraries and slightly more than $940 million the 10 nonuniversity libraries.