300 tag
 
‡a 1 v. (various paginations) : ‡bill., maps ; ‡c 28 cm.
 
‡a 1 sound disc (57 min.) : ‡b digital ; ‡c 4 3⁄4 in.
 
When your item consists of print plus a nonprint component, normally collate the nonprint as accompanying material in the 300 field:
 
+ ‡e 1 sound disc (4 3⁄4 in.)
 
+ ‡e 1 CD-ROM (4 3⁄4 in.)
 
+ ‡e 1 computer disc (3 1⁄2 in.)
 
‡a xxiii, 403 p. : ‡b ill. ; ‡c 24 cm. + ‡e 1 CD-ROM (4 3⁄4 in.)
 
If a disc contains both music (.wav files, for example) and text files (.pdf files, for example), describe it as a CD-ROM in the bib and MFHD.
 
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As a general rule, delete angle brackets and the data they contain:
 
‡a v. <1-12,18>
becomes
 
‡a v.