| 1821 census fragments from County Roscommon | Gacquin, William | Article in Journal | | 1998 |
| A household account from County Roscommon, 1733-4 | Gacquin, William | Article in Book | | 2001 |
| A south Roscommon parish in the eighteenth century | Gacquin, William | Article in Journal | | 1990 |
| Brian Ó Fearghail - poet scribe, and farmer | Gacquin, William | Article in Journal | | 2004 |
| Decade of centenaries: the story of a World War I medal | Gacquin, William | Article in Journal | | 2019 |
| Decade of centenaries: the tragic death of Peter Barrett 1901-1923 | Gacquin, William | Article in Journal | | 2019 |
| Eskerbaun, County Roscommon | Gacquin, William | Article in Book | | 1998 |
| Rev. Dr. James O'Fallon, Bishop of Elphin 1756-1786 | Gacquin, William | Article in Journal | | 1996 |
| Roscommon before the famine : the parishes of Kiltoom and Cam, 1749-1845 | Gacquin, William | Monograph or Collective Volume | Irish Academic Press | 1996 |
| Some notes on St. John's church | Gacquin, William | Article in Journal | | 2004 |