301 Physical Description for Films (Pre-AACR 2) (VM) [obsolete] [USMARC only]:

Field 301 was made obsolete in 1983. Both indicator positions were undefined. The subfield codes were: $a (Extent of item), $b (Sound characteristics), $c (Color characteristics), $d (Dimensions), $e (Accompanying material), and $f (Speed (videorecordings)).

Physical description data in retrospectively converted LC pre-AACR 2 visual materials records are contained in field 300 (Physical Description) with the formerly separately subfield coded color, sound, and videorecording speed information all being recorded in subfield $b (Other physical details).