This bibliography makes no pretense of being exhaustive. The writer has endeavored, however, to list all the source material he has been able to lay hands on. But source material is very fugitive and no doubt there are numerous omissions, especially of leaflets and pamphlets. In general, secondary material has not been included unless it (1) deals directly with the I. W. W. as an organization, (2) is published by the I. W. W. or under its label, (3) is written by a person who has, at one time or another, been a member of the I. W. W. or unless (4) it has been cited in the foregoing pages. There is a vast amount of periodical material dealing with the real or alleged activities and escapades of the I. W. W.: its strikes, free-speech fights, etc. There is also an extensive literature (in English, French, Italian and other languages) devoted to special aspects of syndicalism or I. W. W.-ism. Among the important topics covered are the following: industrial _versus_ craft unionism; parliamentarianism and political action; war and militarism; I. W. W.-ism and (state) socialism; I. W. W.-ism and anarchism; syndicalist tactics; direct action, _sabotage_, the General Strike, job control, etc.; unskilled and migratory labor, etc., etc. A few items of this vast secondary reference material have for obvious reasons been included in this bibliography but the bulk of it has been omitted. _Vide_ note to sec. 5, _infra_, p. 403. 1. OFFICIAL DOCUMENTS OF THE INDUSTRIAL WORKERS OF THE WORLD _Constitution and By-Laws of Industrial Workers of the World_ (adopted at Chicago, 1905), (at head of title "Labor is Entitled to all it Produces"), Chicago, I. W. W. Pub. Bureau, n. d., 32 pp. Original constitution of the I. W. W. _Constitution of the Transportation Department of the I. W. W., and By-Laws of the Steam Railway Sub-Division._ 1905. _Die Industriellen Arbeiterverbänder der Welt_, Vorwort u. Konstitution, Chicago, 1906, 24 pp. _Industrial Workers of the World, Industrial Council of New York City and Vicinity, Constitution and By-Laws_, adopted at New York, 1905, 16 pp., n. d. _Industrial Workers of the World, founded at Chicago, June 27-July 8, 1905_, "Preamble and Constitution, amended 1906, 1907 and 1908, ratified by referendum vote" (at head of title "Labor is Entitled to all it Produces"), Detroit, General (I. W. W.) Headquarters, n. d., 32 pp. _Industrial Workers of the World, Report to the International Socialist and Labor Conference at Stuttgart, Germany, August 18 to 24, 1907._ [Chicago, I. W. W. Press, 1907.] 16 p. Lumber Workers' Industrial Union of the I. W. W. _Fifth semi-annual convention of L. W. I. U. 500, Seattle District, Saturday, August 23, 1919._ 8 p. _L'Union industrielle du monde_, Avant-propos et constitution, amendés, 1906, Chicago, I. W. W., 1906, 31 pp.