Search for maps of your region or country in Search It. For example, the search middle east atlases retrieves the titles "Crossroads of war: a historical atlas of the Middle East" and "Penguin state of the Middle East atlas (revised and updated 3rd ed.)" as well as many other map and atlas items, some in the reference atlas cases and others in the stack areas that can be checked out. The Map Vertical File, located in the Reference area off the Terrell Library atrium, contains hundreds of world, country, state, local, and thematic maps that can also be checked out.
There are many notable online map collections; some examples are
Perry-Castaneda Map Library--Univ. of Texas
World Population. 1950-2050 projection U.S. Census Bureau.
World Population Historical Estimates. 10,000 B.C.-1950 A.D. U.S. Census Bureau.
Europa Year Book. 1968-2007. Holland/Terrell Libraries Stacks (JN1 .E85 )
International Historical Statistics series. Palgrave Macmillan. 6th ed., 2007.
Europe, 1750-2005 Holland/Terrell Libraries Reference (HA1107 .M5 2007)
the Americas, 1750-2005 Holland/Terrell Libraries Reference (HA175 .M55 2007)
Africa, Asia and Oceania 1750-2005 Holland/Terrell Libraries Reference (HA4675 .M552 2007)
Earlier editions of International Historical Statistics are in the Holland/Terrell Libraries stacks and can be checked out. Use the Search It catalog to find the call numbers.
See the Library Guide Historical Statistics (UPenn Libraries) for US and international historical statistics sources.