The townland of Drumnahunshin is in the parish of Kilmore in Armagh County. It is not shown on the map.
Paterson (Armachiana, Vol. 16, p.21) notes:
PRONI records: OS/6/2/9/1 (Surveyed 1835. Engraved 1835.); OS/6/2/9/2 (Surveyed 1835. Engraved 1835. Revised 1860. Revisions engraved 1862.); OS/6/2/9/3 (Surveyed 1835. Revised 1905-6. Published 1908.); OS/6/2/9/4 (Surveyed 1835. Revised 1905-6. Published 1908 (with mss markings in red and stamped ref 2574, 2575).); OS/6/2/9/5 (Surveyed 1905-6. Revised 1953, 1955-6. Levelled 1888 to 1906, 1949. Published 1959. (2 copies).); OS/6/2/21/1 (Surveyed 1834-35. Engraved 1835.); OS/6/2/21/2 (Surveyed 1834-35. Engraved 1835. Revised 1860. Revisions engraved 1863.); OS/6/2/21/3 (Surveyed 1834-35. Revised 1906. Published 1908. Reprinted 1921.); OS/6/2/21/4 (Surveyed 1834-35. Revised 1906. Published 1908. (2 copies), Reprints 1934-1957.); OS/6/2/21/5 (Surveyed 1906. Revised 1955. Levelled 1889 and 1906. Published 1958.); OS/6/2/25/1 (Surveyed 1834-35. Engraved 1835.); OS/6/2/25/2 (Surveyed 1834-35. Engraved 1835. Revised 1860. Engraved 1863.); OS/6/2/25/3 (Surveyed 1834-35. Revised 1906. Published 1909. Reprinted 1931.); OS/6/2/25/4 (Surveyed 1834-35. Revised 1906. Levelled 1903-06.Published 1909. (2 copies - reprints 1952-1958).); OS/6/2/25/5 (Surveyed 1834-35. Revised 1906. Levelled 1903-06.Published 1909. Reprint 1931, 1935-1941 with stamped ref 2775 and 2776.); OS/6/2/25/6 (Surveyed 1906. Revised 1955-56. Levelled 1903 and1906. Published 1959. (2 copies).); VAL/1/B/229B, VAL/1B/245A (1st valuation records.); VAL/12B/10/1A, VAL/12B/10/1B, VAL/12B/10/37A, VAL/12B/10/31B, VAL/12B/10/37C, VAL/12B/10/37D, VAL/12B/15/3B, VAL/12B/15/3C, VAL/12B/15/3D, VAL/12B/15/3E (Valuation annual revision list.); VAL/2B/2/26C, VAL/2B/2/38A (Griffith valuation list.); VAL/12B/15/3A (Valuation annual revision list.).