Title of English ed.: Bulletin of the International Working Union of Socialist Parties; of the French ed.: Bulletin de l'Union des partis socialistes pour l'Action internationale.
Reprint includes English and French editions of vol. 2 and nos. 1 and 2 of vol. 3.
German, English, and French.
Reprint. Originally published with varying frequencies: Wien : I.A.S.P.