"Voices of Sulanca" is a specialized book that explores the social and historical development of the Feira da Sulanca phenomenon in the Agreste pernambucano mesoregion during the 1950s and 1960s. The book analyzes how this productive and commercial process established itself in the region, drawing on various disciplines such as development sociology, labor sociology, rural sociology, and social anthropology. By examining regional customs and traditions, it illustrates how family, informal labor structures, and migrations shaped the lives of people in the region and contributed to the emergence of the Feira. The methodology of the book is based on oral history, documented through interviews with pioneers and their descendants, to provide a comprehensive picture of the social dynamics and economic practices of the region.