MSU Libraries policy is that any CD-ROM which contains the same content as a print monograph will be cataloged on its own record. Often the CD-ROM is packaged with the book, and it may be marked with a supplementary material flag by Acquisitions. However, if the CD-ROM contains the same text as the book, it is not really supplementary and needs to be cataloged on its own record.
CD-ROMs are cataloged in whatever format is appropriate for their content -- text (type a), maps (type e), etc. Older titles may still be found cataloged in the Electronic Resource format (type m) even though they should be in another format. This is acceptable for copy, but not for original.

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