For authors with similar names, see Author:John IV.
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Pope John IV
Works by John IV
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Works about John IV
- "Pope John IV," in Catholic Encyclopedia, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
- "John IV (pope)," in Encyclopædia Britannica (11th ed., 1911)

Works by this author published before January 1, 1927 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.
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