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In all my records, I've included in 336, 337 and 338:

$atext $b txt $2 rdacontent

$aunmediated $b n $2 rdamedia

$avolume $b nc $2 rdacarrier

but I'm not sure what the significance of the $b elements are and
whether they need to be included or not.  I confess, I saw these $bs
in some example RDA MARC records.

Sandra