COLOMBIA – Bortfeldt, Dieter: The Workbook. Notes on Reprints and Forgeries of Colombian Stamps (2004/2007). Part I: The Classic Period 1859–1868, 211 pages, Part II: The Sovereign States of Columbia, 252 pages, Part III: The Columbian Airmails, 240 pages, hardcover with gold title imprint on front and spine, good condition. Estimate: 500 Euro
