Yang Stamp Catalogue

Yang`s catalogue is one of the three stamp catalogues published by Yang`s Stamp Service of Hong Kong: To correlate Wang catalog numbers and Scott catalogue numbers for Hong Kong consult Hong Kong Scott-Yang Catalog Correlation by Ralph Weil with Michael Rogers. 2006, second edition. To correlate Wang catalog numbers and Scott catalog numbers for.....
Found on http://en.wikipedia.org/wiki/Yang_Stamp_Catalogue
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