Basic research on the Amsterdam sub-bureau of the Comintern /The letters and manuscripts of Sen Katayama in Mexico, 1921 /The correspondence between Japanese socialists and de Amsterdam sub-bureau of the Comintern, 1919-1920 /The group of English-speaking communists in Russia and its organ, The Call: S.J. Rutgers and the International (IX) /A listing of the works, manuscripts, and other memorabilia of G. Allen Hutt : (from the Allen Hutt Working Library on the British Labour Movement, Anglo-Soviet Relations, and the Theory of Marxism-Leninism) /A listing of the works (articles, reviews and miscellanies) of G. Allen Hutt : from the Allen Hutt's Working Library of the British Labour Movement, Anglo-Soviet relations and the theory of Marxism-Leninism (part 2) /English publications in early Soviet Russia : S.J. Rutgers and the International (X) /Sen Katayama, the Japanese Socialist Group in America and the early Comintern /The bolshevik literature in the U.S.A. : from March 1917 through the spring of 1919 /"Sen Katayama, the Japanese communists in Soviet Russia and the early comintern"/Basic research on the Pan-American Agency of the Comintern /The early Comintern in Siberia and the Far East /The Latvian Soviet power and the "World Revolution" from the autumn of 1918 through the spring of 1919 : S.J. Rutgers and the International (One of the Second Series) /The early comintern in Amsterdam, New York and Mexico City /The early Comintern in Amsterdam, New York and Mexico City /The early Comintern and Japanese socialists residing abroad : a transnational network /The Stockholm Conference of 1917 : the causes of its failure /Comprehensive research on the Pan-American agency of the Comintern /S.J. Rutgers and the International /S.J. Rutgers and the International /Unpublished letters of Sen Katayama to Karl Kautsky, 1907-1915 /S.J. Rutgers and the International : a supplement to part 1, 2 /"Internationalized Bolshevism" : the Bolsheviks and the International, 1914-1917 /Sen Katayama and the Second International : in search of new documents, 1904-1916 /Sen Katayama, S.J. Rutgers and H. Sneevliet, 1916-1921 : in reprinting nos. 1-6 of The Heimin /S.J. Rutgers and the International /S.J. Rutgers and the International /S.J. Rutgers and the International /S.J. Rutgers and a case study of the international history of socialism : association with Sen Katayama, the Bolsheviks and the American left wing /S.J. Rutgers and the International : a supplement to part 6 /S.J. Rutgers and the International /