Description Sample Depending on the period a page represents from 1,000 years to 10 as follows: Prehistory – 3 spreads 6,000-3,000bc – 1,000 years per spread 2000bc-1600ad – 100 years per spread 1601-1800ad – 50 years per spread 1801-1900ad – 20 years per spread 1901-onwards – 10 years per spread For more information about keeping a Book of Centuries check out this page The only difference between the BC/AD and BCE/CE is the dating format.
