No; such a work would be in the public domain and cannot be retroactively registered.
Copyright in Historical Perspective was created in 1968.
1968.
Xtreme Radio was created in 1968.
KSDT Radio was created in 1968-06.
BBC Radio Durham was created in 1968.
Radio Subotica was created on 1968-11-29.
Episodes before July 1968: ABC Weekend Television Episodes after July 1968: Thames Television
BBC Radio Leeds was created on 1968-06-24.
North Country Public Radio was created in 1968.
BBC Radio Stoke was created on 1968-03-14.
BBC Radio Nottingham was created on 1968-01-31.
Brendan Jones - radio personality - was born in 1968.