ARL has just released a report on patterns of collection of non-US books in member libraries based on an analysis of their holdings in Worldcat [pdf]
The report “Changing Global Book Collection Patterns in ARL Libraries” was prepared for the Global Resources Network (GRN) by: Mary E. Jackson, Auto-Graphics, Inc. (formerly Association of Research Libraries); Lynn Silipigni Connaway, OCLC Online Computer Library Center, Inc.; Edward T. O’Neill, OCLC Online Computer Library Center, Inc.; and Eudora Loh, University of California, Los Angeles. [Association of Research Libraries :: Report Documents Changes in Global Collection Patterns in ARL Libraries]
Main findings are the low levels of overlap between ARL collections and the progressive decline in volume of acquisition of non-US titles.
The WorldMap was developed in association with this project.