(1960ca). Billig´s Handbook on Postmarks (Volumen Nº13) THE POSTAL MARKINGS OF SPAIN. Theo Van Dam. New York, 1960ca. (interesantÃsimo libro de matasellos españoles)
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(1960ca). Billig´s Handbook on Postmarks (Volume Nº13) THE POSTAL MARKINGS OF SPAIN. Theo Van Dam. New York, 1960ca. (very interesting book with Spanish postmarks)