O'Brien, A. P., Collins, M., McGrath, S., & Irish Volunteers. (1919). Correspondence between the Art O'Brien and the London Office with Michael Collins and the Irish Volunteers with subjects including intelligence reports, political prisoners, and accepting the services of Erskine Childers and John Chartres.

O'Brien, Art Patrick, et al. Correspondence Between the Art O'Brien and the London Office with Michael Collins and the Irish Volunteers with Subjects Including Intelligence Reports, Political Prisoners, and Accepting the Services of Erskine Childers and John Chartres. 1919.