The Top 25 US Public Libraries’ Collective Collection, as Represented in WorldCat “characterizes the combined collections of the top 25 US public libraries, as represented in the WorldCat database. These libraries account for more than 34 million holdings in WorldCat across 13.5 million distinct publications. The report considers overlap vs. uniqueness of holdings for these libraries, and compares their collective collection with the collective holdings of the rest of the US public libraries whose holdings are represented in WorldCat. It also compares their collective collection to the collective WorldCat holdings of ARL member libraries, and to all US academic libraries represented in WorldCat.”>The Top 25 US Public Libraries’ Collective Collection, as Represented in WorldCat characterizes the combined collections of the top 25 US public libraries, as represented in the WorldCat database. These libraries account for more than 34 million holdings in WorldCat across 13.5 million distinct publications. The report considers overlap vs. uniqueness of holdings for these libraries, and compares their collective collection with the collective holdings of the rest of the US public libraries whose holdings are represented in WorldCat. It also compares their collective collection to the collective WorldCat holdings of ARL member libraries, and to all US academic libraries represented in WorldCat.”