Ó Lochlainn, C., O'Brien, W., & Three Candles Press. (1949). Typescript letter from Colm Ó Lochlainn to William O'Brien containing a paragraph from a letter received from "E. Byrne Hackett of The Brick Row Book Shop, fifty-five fifth avenue, New York, which includes praise for the 'Irish Book Lover' journal and also 'Devoy's Post Bag', which he mentions will be promoted to forty other librarians of Irish ancestry by himself through a sepcial letter.

Ó Lochlainn, Colm, et al. Typescript Letter from Colm Ó Lochlainn to William O'Brien Containing a Paragraph from a Letter Received from "E. Byrne Hackett of The Brick Row Book Shop, Fifty-five Fifth Avenue, New York, Which Includes Praise for the 'Irish Book Lover' Journal and Also 'Devoy's Post Bag', Which He Mentions Will Be Promoted to Forty Other Librarians of Irish Ancestry by Himself Through a Sepcial Letter. 1949.