'The <b>cc</b> on an office letter refers back to this now little-used office supply'
carbon copy (or carbon paper)
ABBREV.: The <b>cc</b> on an office letter refers back to this now little-used office supply
The <b>cc</b> on an office letter refers back to this now little-used office supply
The <b>cc</b> on an office letter refers back to this now little-used office supply
ABBREV.
carbon copy or carbon paper
ABBREV.