Dictionary of the Irish language based mainly on Old and Middle Irish materials ... /
Royal Irish Academy.
Marstrander, Carl J. S.(Carl Johan Sverdrup),1883-
Bergin, Osborn,1873-1950.
Joynt, Maud.
Knott, Eleanor.
Dublin,
1913-1975.
A-C is already covered by Kuno Meyer's "Contributions to Irish lexicography".