300 Subfield $b - Other physical details:
Subfield $b contains information that further specifies other physical characteristics of an item, such as identification of illustrative matter, coloration, playing speed, groove characteristics, presence and kind of sound, number of channels, motion picture presentation format, etc.
In records formulated according to ISBD principles, subfield $b contains all data following a colon ( : ) and up to and including the next mark of ISBD punctuation [e.g., a semicolon ( ; )].
Examples:
300 ##$a104 p. :$bill. ;$c20 cm.
300 ##$av. :$bill. (some col.) ;$c25 cm.
300 ##$a2 computer disks :$bsd., col. ;$c3 1/2 in.
300 ##$a1 globe :$bcol., wood, mounted on brass stand ;$c12 cm. in diam.
300 ##$a1 sound disc (20 min.) :$banalog, 33 1/3 rpm, stereo. ;$c12 in.
300 ##$a1 sound disc (56 min.) :$bdigital, stereo. ;$c4 3/4 in.
300 ##$a14 film reels (157 min.) :$bPanavision ;$c16 mm.
300 ##$a1 videoreel (Ampex 7003) (15 min.) :$bsd., b&w ;$c1/2 in.
300 ##$a1 print :$blithograph, 4 cols. ;$csheet 17 x 21 cm.
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