1
Udgivet 2016
...United States Population Statistics....
Full text available from Research Library
Electronisk eBog
2
Udgivet 2009
...United States Population Statistics....
Full text available from Environmental Science Database
Electronisk eBog
4
...United States Population Periodicals....
Full text available from ABI/INFORM Global: 09/01/1997 to 08/31/2004
Full text available from Engineering Database: 09/01/1997 to 08/31/2004
Electronisk Tidsskrift