 Although Pagán, a Puerto Rico senator (1933-1939) and U.S.Congressman (1939-1945), had written half a dozen other books on politics prior to this set, this set is considered the climax of his political penmanship.Critical reviewer Luis Burset states that "for its thoroughness, focus, and relevance, Bolívar Pagán's "Historia de los Partidos Políticos Puertorriqueños" is now mandatory reading for understanding the development of Puerto Rico's political parties... it enjoys a position of choice in the Puerto Rican historiography.