 Complete the following phrase:  Basadre was a prolific writer; his numerous works on the history of Peru in the 19th and 20th centuries are still a benchmark for historians interested in this period. His publications include La multitud, la ciudad y el campo en la historia del Perú 1929, La iniciación de la República 1929-1930, Perú, problema y posibilidad 1931, La promesa de la vida peruana 1943, El conde de Lemos y su tiempo 1945, Meditaciones sobre el destino histórico del Perú 1947, Chile, Perú y Bolivia independientes 1948, El Perú en la cronología universal, 1776-1801 1957, El azar en la historia y sus límites 1971, La vida y la historia 1975 and Elecciones y centralismo en el Perú 1980. However, his most important work is his Historia de la República del Perú History of the Republic of Peru, first published as a single volume in 1939. It grew in size with every new edition until reaching sixteen volumes in the 6th edition of 1968. By that time it covered with rigorous detail Peruvian history from 