William J Kozersky, Philatelist
William J Kozersky, Philatelist
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REFERENCE LITERATURE
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Catalogs on Paper
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Specialty Catalogs
Specialty Catalogs
Christmas Seals of Sydslesvigsk, Forening, Schlweswig, Flensburg, Germany
Delandre Catalog, Society Des Timbres de Guerra, 1914/1918
Handbook of Mexican TB Seals, 2011 ed.
Medicine through Philately, Spanish TB Seals, 2010 ed
Yvert & Tellier Catalog, Spec de Timbres de Guerra de Russian, Ukraine, etc