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President wants everyone but himself to pay more
Topic - Vasil Nikolov
"We started excavation work in 2005, but only after this archaeological season did we gather enough evidence to back up this claim," Nikolov told The Associated Press.
Vasil Nikolov, a professor from Bulgaria's National Institute of Archaeology, said the stone walls excavated by his team near the town of Provadia are estimated to date between 4,700 and 4,200 B.C. He said the walls, which are 3 meters (10 feet) high and 2 meters (6 1/2 feet) thick, are believed to be the earliest and most massive fortifications from Europe's prehistory.