E. D. Colón and J. E. Berrocal, “AN EXPERIMENT ON DRAINAGE BY MEANS OF PUMPS - IN THE CANE PLOTS "MANUEL MOLINA", "FABRICA PAJAS 1a.", AND ‘FABRICA PAJAS 2a.’,‘ OF THE GIORGETTI COMPANY, IN THE MUNICIPALITY OF BARCELONETA, YEARS 1923-1925”, JAUPR, vol. 9, no. 4, pp. 257–272, Oct. 1925.