Below is a short list of the most commonly used approved wording/abbreviations for expressing volume designations. For a more detailed list, including definitions, you can go to AACR2 to RDA (Appendix B. Abbreviations and Symbols) or or http://staff.library.mun.ca/staff/toolbox/abbrev.htm. See also the HUL Continuing Resources Working Group document "Abbreviations for Captions in Holdings Data: Supplement to Abbreviations found in AACR2".
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