His major work, "Historia de la Dominación de los Árabes en España", was published in 1820–1821. He completed only the first volume before his death. Juan Tineo compiled volumes two and three from Conde's manuscript. This work was translated into German (1824–1825), French (1825) and English (1854). Although it has since been superseded by other works, Conde's work stimulated others in the same field and in the context of time it was considered a valuable work. Another of Conde's works was his translation and annotation of "Thekr al Andalus taleef Sherif Aledris / Descripción de España de Xerif Aledris, conocido por El Nubiense", first published in Madrid by the Imprenta Real in 1799.