Polytechnic Institute of Puerto Rico
(1938)
Contiene: vol. 1 no. 4 (feb. 1, 1938), Vol. 1, no. 5 (march 1, 1938), Vol. 1, no. 6 april 1, 1938, Vol. 1, no. 7 may 1, 1938, Vol. 1, no. 8 (june 1, 1938), Vol. 1, no. 9 (june 13, 1938), Vol. 1, no. 10 (agosto 1, 1938), ...