Historians say increased censorship in China makes research hard
BEIJING - At Beijing's largest antiques market, Panjiayuan, among the Mao statues, posters and second-hand books are prominent signs warning against the sale of publications that might have state secrets or 'reactionary propaganda.'
Some of the signs display a hotline number so that citizens can tip off authorities if they witness an illegal sale.
China's antique and flea markets were once a gold mine of do