“…Santos’ archives confirm that he was a reader of Kropotkin, and that in his notes he addressed Kropotkin's urban writings, noting: “Will the capitalist city survive? The Engels’ despair and the Kropotkin's hope.” Brazilian scholarship suggests that there were similarities between Santos’ ideas and the works of authors sharing many of Reclus's and Kropotkin's views on urban matters, such as Patrick Geddes and Ebenezer Howard, especially around the notion of solidarity, “not based on the moral aspect, but on the coexistence [of social groups in space] by necessity of mutual protection” (Pozzer, Leite, Albuquerque, Argollo Ferrão, & Fuad Gattaz, , p. 59). If this recalls Kropotkin's concept of mutual aid, Kropotkin's books, including Mutual aid , fields factories and workshops and selected works in Spanish and Portuguese, were part of Santos’ personal library, also including Reclus's classics such as L'Homme et la Terre…”