Unknown Territory was created in 1991.
The Territory was created in 1981.
Sender Unknown was created in 2006.
Fear of the Unknown was created in 1981.
To a God Unknown was created in 1933.
Encounter with the Unknown was created in 1973.
Identity Unknown was created in 1945.
A Feast Unknown was created in 1969.
The Unknown Terrorist was created in 2006.
Challengers of the Unknown was created in 1957.
Journey to the Unknown was created in 1968.
Voyage into the Unknown was created in 1984.
Unknown Africa was created in 2007.