Most of the correspondence is between Jack Lane and Niall Ó Síocháin with additional letters from Brendan Clifford, Manus O'Riordan and Seamus Lantry, and appeared in "The Corkman", 2002-2003.
D.D. Sheehan : why he left Cork in 1918 : a correspondence from 'The Corkman'. ISBN 1903497140. Published by Aubane Historical Society in 2003. Publication and catalogue information, links to buy online and reader comments.