Pasta atklātne sakarā ar pastmarku un atklātņu izstādi Daugavpilī /1961/
Izdevniecība, izdošanas laiks un vieta
https://sites.google.com/site/filatelisticeskievystavkivsssr/%D0%B3%D0%BB%D0%B0%D0%B2%D0%BD%D0%B0%D1%8F-%D1%81%D1%82%D1%80%D0%B0%D0%BD%D0%B8%D1%86%D0%B0/%D0%B4%D0%B0%D1%83%D0%B3%D0%B0%D0%B2%D0%BF%D0%B8%D0%BB%D1%81-%D0%BB%D0%B0%D1%82%D0%B2-%D1%81%D1%81%D1%
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