There are currently 28 member libraries:
Bodleian Japanese Library
Bodleian Law Library
Bodleian Library
Computing Laboratory Library
Corpus Christi College Library
Earth Sciences Library
Educational Studies Library
Engineering Science Library
Experimental Psychology Library
Geography and the Environment Library
History Faculty Library
Hooke Library
Indian Institute Library
Jesus College Library
Middle East Centre Library
Nuffield College Library
Oxford University Museum of Natural History Library
Plant Sciences Library
Queen's College Library
Radcliffe Science Library
Rhodes House Library
Sackler Library
Social Science Library
St Hugh's College Library
Taylor Institution Modern Languages Faculty Library
Vere Harmsworth Library (Rothermere American Institute)
Wellcome Unit for the History of Medicine Library
Zoology Library
The following chart shows how the number of member libraries has changed over the years, increasing as new libraries join and decreasing as libraries merge together into larger units.