Two paperback editions were published by Playboy Press in 1980 and 1983, and Rhinoceros released a paperback edition in the U.S. in 1995.
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Both featured cover art and interior illustrations by Richard Corben.
Tomb of the Unknown Soldier | Out of the Unknown | Corpus Christi (feast) | Challengers of the Unknown | Feast of Fools | Belshazzar's Feast | Unknown Pleasures | Blood Feast | Babette's Feast | The Unknown Warrior | Persons Unknown (TV series) | Persons Unknown | Feast of the Cross | Feast of Saints Peter and Paul | Domain of unknown function | XCOM: Enemy Unknown | Unknown Hinson | Trimalchio's Feast and other mini-mysteries | Tomb of the Unknown Soldier (Moscow) | The Unknown Comic | Letter from an Unknown Woman | Feast of the Rosary | Feast of the Ass | Feast Days | Feast 3: The Happy Finish | A Feast for Crows | X the Unknown | Unknown years of Jesus | Unknown to No One | Unknown Mortal Orchestra |