O'Connor, R. and E. Henry (1995). Estimates of Gross and Net Output and Income Arising in Agriculture in All Ireland and in the Free State Area in Selected Years Between 1908 and 1926-27, ESRI Working Paper 58, Dublin: ESRI, https://www.esri.ie/publications/estimates-of-gross-and-net-output-and-income-arising-in-agriculture-in-all-ireland-and-in-the-free-state-area-in-selected-years-between-1908-and-1926-27