Date derived from a sample of OCLC records. Data was collected for research published by "Cataloging & Classification Quarterly." Full citation of the paper is: Park, Taemin Kim & Andrea M. Morrison (2017). The Nature and Characteristics of Bibliographic Relationships in RDA Cataloging Records in OCLC at the Beginning of RDA Implementation. Cataloging & Classification Quarterly, vol. 55, issue 6. http://www.tandfonline.com/doi/full/10.1080/01639374.2017.1319451. A post-print of the paper is available here: http://hdl.handle.net/2022/21657.