Irish Transport and General Workers' Union & O'Brien, W. (1949). Letter from [D. McAllister?], of the Belfast branch of the I.T.& G.W.U., to William O'Brien informing him of the set-up in which to order books and assuring him that he will get a special early delivery of the catologue to order from, mentioning he enjoyed reading 'Devoy's Post Bag' and looks forward to the second volume and also the upcoming Connolly book, and also discussing the books he orders in for the Belfast free library and branch libraries.

Irish Transport and General Workers' Union and William O'Brien. Letter from [D. McAllister?], of the Belfast Branch of the I.T.& G.W.U., to William O'Brien Informing Him of the Set-up in Which to Order Books and Assuring Him That He Will Get a Special Early Delivery of the Catologue to Order from, Mentioning He Enjoyed Reading 'Devoy's Post Bag' and Looks Forward to the Second Volume and Also the Upcoming Connolly Book, and Also Discussing the Books He Orders in for the Belfast Free Library and Branch Libraries. 1949.