1920. CATALOGO MUNDIAL GALVEZ SELLOS DE CORREOS Y TELEGRAFOS EMITIDOS DESDE 1840 A 1919. Miguel Gálvez Jiménez. 10º Edición. Madrid, 1920. (volumen algo fatigado)
Automatically generated translation
1920. GALVEZ WORLD CATALOG POSTAL AND TELEGRAPH STAMPS ISSUED FROM 1840 TO 1919. Miguel Gálvez Jiménez. 10th Edition. Madrid, 1920. (somewhat tired volume)