Coffey, P., & O'Brien, W. (1921). Letter and copy of letter from Rev. Peter Coffey, Professor of Maynooth College, to William O'Brien thanking him for a copy of his booklet, discussing articles, including his own, that sympathise with the aspirations of Irish Labour and also writing in reference to "The Axe to the Roof".

Coffey, P., and William O'Brien. Letter and Copy of Letter from Rev. Peter Coffey, Professor of Maynooth College, to William O'Brien Thanking Him for a Copy of His Booklet, Discussing Articles, Including His Own, That Sympathise with the Aspirations of Irish Labour and Also Writing in Reference to "The Axe to the Roof". 1921.