Keywords:
collection,
stamp,
picture,
communications,
postage,
mail,
post,
postmark,
letter,
mark,
isolated,
retro,
vintage,
USSR,
geologist,
russian,
Russia,
symbol,
travel,
geology,
geography,
research,
industry,
drilling,
boring,
tower,
oil-rig,
derrick,
rig,
drill,
environment,
nature,
petroleum,
oil,
pump,
sand-dune,
barkhan,
dune,
transport,
landscape,
stone,
sand,
desert,
helicopter,
mountains,
prospecting,
exploring,
search,
quest,
science,
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