http://www.mbmarktcons.com/mbmarkt/irdinfo.htm
Information on the Internet Resources Database project. Includes details on downloading the software to run it and obtaining the entire database on disc.

http://www.pcwebopedia.com/database.htm
Definition and pictorial demonstration of a database from field to file.

http://www.yahoo.com/Computers_and_Internet/Software/Databases/Shareware/
Links to downloadable database shareware programs.

http://www.pcwebopedia.com/database_management_system_DBMS.htm
Definition and description of DBMS. A lot of links to database suppliers and software.

http://www-groups.cs.st-and.ac.uk/~history/Mathematicians/Hollerith.html
Biography of Herman Hollerith and his contributions to mathematics and computer history.

http://www.taltech.com/Bar_Code/bckb/howabar.htm
How bar-code readers (several kinds are described) read the values from a bar code. Includes informative animation of a beam of light scanning a bar code.