1931: The Revolution In Spain [pamphlet]
1931: Communism and Syndicalism [pamphlet]
1931: The Mistakes of Rightist Elements of the Communist League on the Trade Union Question
1931: The Case Of Comrade Ryazanov
1931: Thälmann and the “People’s Revolution”
1931: The Spanish Revolution And The Dangers Threatening It
1931: Workers’ Control of Production
1931: Against National Communism! (Lessons of the “Red Referendum”)
1931: A Letter To Albert Treint [Letter on the German Revolution]
1931: Factory Councils and Workers’ Control of Production
1931: [1st] Letter to the Communist League
1931: Germany, the Key to the International Situation Significant work!
1931: For a Workers’ United Front Against Fascism
1931: The Permanent Revolution (book) Significant work!
1931: For the Spanish Revolution
1931: For Communist Unity In Spain
1931: The Problems Of The Spanish Revolution
1931: Thermidor and Bonapartism
1931: The Character of the Revolution
1931: Problems of the Spanish Revolutio
1931: Tactics Flowing from the Election Results
1931: The Role of Strikes in a Revolution
1931: On The Slogan of Soviets: From a Letter to Andres Nin