O'Connor, R. and E. Henry (1996). Estimates of Gross and Net Output and Income Arising in Agriculture in All Ireland and in the Free State Area in Selected Years between 1900/01 and 1926/27, ESRI Working Paper 77, 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-1900-01-and-1926-27