Tyler, V. E. Focus on Forgeries: A Guide to Forgeries of Common Stamps.
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Chicago-čujuhus (17. p.)
Tyler, Varro E. Focus on Forgeries: A Guide to Forgeries of Common Stamps.
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MLA-čujuhus (9. p.)
Tyler, Varro E. Focus on Forgeries: A Guide to Forgeries of Common Stamps.
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