OCLS hosts and maintains the Colleges Union Catalogue (CUC), a publicly available, shared resource comprised of bibliographic records drawn from the colleges’ libraries. Ontario’s college libraries have maintained a union catalogue for several decades. The CUC upholds a high standard of bibliographic record by ensuring that additions to the catalogue meet minimum requirements; as a collective resource the CUC also prevents a duplication of record creation and management efforts. The catalogue, also known as BibC, is updated regularly by drawing on new and modified records from the bibliographic databases of contributing colleges. Technical support is available through Help Desk for any CUC-related problems such as uploading or removing records. The management and maintenance of the Colleges Union Catalogue is a core OCLS service, and the Colleges Union Catalogue and Libraries’ Digital Repository Steering Group directs this work.