 It also participates in Key Action 1 of the European Union-wide Erasmus+ programme, encouraging staff and student mobility for teaching, although not the other Key Actions in the programme.The School is a member of the Association of Commonwealth Universities, the Association of Professional Schools of International Affairs, the European University Association, the G5, the Global Alliance in Management Education, the Russell Group and Universities UK, and is sometimes considered part of the 'Golden Triangle' of universities in south-east England, along with the University of Oxford, the University of Cambridge, University College London, Imperial College London, and King's College London.The School's main library, the British Library of Political and Economic Science is located in the Lionel Robbins Building and contains over 4 million print volumes, 60,000 online journals and 29,000 electronic books.