1970s Latin America was a hotbed of theoretical and methodological innovation in the social sciences and the arts, developing novel approaches to studying social reality to support social movements. This article uses Colombian sociologist Orlando Fals Borda’s field notes and his four-volume work Historia doble de la Costa to analyze how he and his colleagues, working in collaboration with the Asociación Nacional de Usuarios Campesinos on the Caribbean coast, developed the methodology of participatory action research, which attempted to erase the distinction between researchers and researched, and to rewrite the history of the peasantry from below using novel formats.