To help compare sizes of different areas, here is a list of areas between 100 million km2 and 1,000 million (American billion) km2. See alsoareas of other orders of magnitude.
... the city of Cologne in
1838, contained at the time 400 different editions.
De Backer (Essai, ut inf.) enumerates 545 Latin
and about 900 French editions.
Originally ...