[Working decision: No longer treat later editions as an LC exception. If LC's classification varies from previous editions in MIT's catalog, either in class number or cuttering (or both), accept LC's practice. Earlier editions held by MIT will be classed to LC's latest decision only upon request by divisional library.]
When MIT has the earlier or original edition, continue to use MIT's call number (modifying only the date and/or work letter), even if this call number differs from LC's, provided the class number is the same as LC's. However, if LC uses a new or different class number, accept LC's call number.
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Drafted by Jo Lynne Byrd and Eric Celeste 920301; maintained by Gordon Thomas and last updated on 021108.