Bad historical data

I heared that a few years ago someone compared historical data with actual old newspapers in libraries and found out that a lot of historical data out there is fake/bad. Anyone have any info on this?
 
I heared that a few years ago someone compared historical data with actual old newspapers in libraries and found out that a lot of historical data out there is fake/bad. Anyone have any info on this?
Are you just spamming the forum with useless questions to get a high posts count and then try to sell us stuff ?
 
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