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- "Ourselves Alone", "The Voice of the Nation", "The Irish Catholic", "Young Ireland", "The Union", and "Paddies Evermore" under pen name "Slievegullion" from The Spirit of the Nation (1843)
Works about O'Hagan
- "O'Hagan, John," in Dictionary of National Biography, 1885-1900, London: Smith, Elder, & Co. (1885–1900) in 63 vols.
- "John O'Hagan," in Catholic Encyclopedia, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
Some or all works by this author were published before January 1, 1928, and 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.