Mullin, M., & Pearse, P. (1902). Letter from M. Mullin, C. C., Killygordon, Co. Donegal to Padraic Pearse enquiring the status of the printing and publishing of the "Phonetic Key of Ulster Gaelic" for students of Irish which he fears may have been mislaid by the Gaelic League Publications Committee.

Mullin, M., and Padraic Pearse. Letter from M. Mullin, C. C., Killygordon, Co. Donegal to Padraic Pearse Enquiring the Status of the Printing and Publishing of the "Phonetic Key of Ulster Gaelic" for Students of Irish Which He Fears May Have Been Mislaid by the Gaelic League Publications Committee. 1902.