|
Not a very detailed graph number wise, but I see it as an increase of about 1/2 billion more books?
With books published prior to 1700 (around 1000 years) being around 500,000,000 (according to graph) and the addition of approximately the same amount in 100 years seems like a spurt to me.
Helen
Last edited by speakingtohe; 02-01-2012 at 07:23 PM.
|