(p) Firstsearch (powered by Worldcat)

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FirstSearch is a proven and highly trusted tool that empowers anyone to find the authoritative content they need in every format from worldwide library collections. FirstSearch delivers the precise, full-featured WorldCat searching that library staff and researchers value. 

There are over 498 million items on FirstSearch, from as early as 4000 BCE to the present.

First Search is an excellent way to find out which libraries own what items when doing research for interlibrary loan.