Latorilla, Elpidio Radio operator's codebook / Elpidio Latorilla. - Mandaluyong City : National Book Store, 1994. - ix, 205 pages ; 21 cm Includes biographical records. ISBN: 971-08-5791-6 Subjects--Topical Terms: Radio operator's code. Dewey Class. No.: Fil./G.Ed. 384.52 L358 1994