English: The stamp on this letter is published in
Image:Souvenir-Sheet-2002.jpg with explicit permission by the copyright owner, the State Agency for Information Technology and Communications of Bulgaria:
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/2.5/bg/deed.enCC BY 2.5 bgCreative Commons Attribution 2.5 bgtruetrue
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