RARE RUSSIAN ENVELOPE w. SIGNATURES, ARCTIC

RARE RUSSIAN ENVELOPE w. SIGNATURES, ARCTIC
Russian Envelope for the Arctic, 1991
The envelope has a lot of very rare Stamps and signatures on the back. Very good condition.
ESTIMATE PRICE: $50 - $70.
Recently the same envelopes on auction Catawiki sold for $53 - please see the screenshot.
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WIKIPEDIA: Polar seas is a collective term for the Arctic Ocean (about 4-5 percent of Earth's oceans) and the southern part of the Southern Ocean (south of Antarctic Convergence, about 10 percent of Earth's oceans). In the coldest years, sea ice can cover around 13 percent of the Earth's total surface at its maximum, but out of phase in the two hemispheres. the polar seas contain a huge biome with many organisms. Among the species that inhabit various polar seas and surrounding land areas are polar bear, reindeer (caribou), muskox, wolverine, ermine, lemming, Arctic hare, Arctic ground squirrel, whale, harp seal, and walrus. These species have unique adaptations to the extreme conditions. Many might be endangered if they cannot adapt to changing conditions. Contrary to popular opinion, the World Wildlife Fund studies for polar bears show that this species has prospered since 1950, attaining five times the numbers found in 1950. In general, Arctic ecosystems are relatively fragile and slow to recover from serious damage.