530 Subfield $c - Availability conditions:

Subfield $c contains the availability conditions which refer to the terms under which the additional physical form of the materials is available (e.g., Photocopies at cost).

Example:

530 ##$aAvailable in microfilm as part of the Papers of Grover P. Stover;$bDocumentary Microfilms, 450 East 52nd St., New York, N.Y. 10006;$cBuyers must acquire entire film set;$dDM-GPS81.