Category:Scientific events on postal envelopes
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Media in category "Scientific events on postal envelopes"
The following 5 files are in this category, out of 5 total.
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Russia 1872 Folded letter to Baden back.jpg 3,117 × 2,479; 7.35 MB
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Russia 1872 seal.jpg 1,851 × 1,805; 3.34 MB
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USSR EWCS №19 Botanical congress sp.cancellation (with stamp).jpg 2,280 × 1,623; 3.73 MB
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USSR EWCS №19 Botanical congress sp.cancellation.jpg 2,284 × 1,633; 3.63 MB
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USSR EWCS №26 ICID regional conference.jpg 2,297 × 1,638; 3.02 MB