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"This book includes the work done by Clarence Kailin, friend and companion of the North American Brigadista John Cookson, who died in the front of Aragon, who has gathered the letters written by him to his family during the Spanish Civil War, in addition to multiple Opinions about him, coming from other comrades and friends. In these letters we can appreciate his feelings, experiences and ideas about fascism, the Spanish contest and his commitment to the struggle for democracy, his pacifism, his appreciation for science at the service of humanity, his critical attitude within Marxism-Leninism, Among other characteristics of his personality… "