| Information about Nations’ Populations | http://bessel.org/popnatns.htm |
| Information about U.S. States’ Populations | http://bessel.org/popstate.htm |
| Information about Slave and Free Populations in the U.S. prior to and during the 1860s | http://bessel.org/slavfree/slavfree.htm |
| Information about Cities’ Populations | http://bessel.org/popcity.htm |
