Hi Jeff,

Here you'll find 3 papers from E.F.Codd ,

A Relational Model of Data for Large Shared Data Banks

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.98.5286&rep=rep1&type=pdf

Extending the Database Relational Model to Capture More Meaning

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.84.9469&rep=rep1&type=pdf

RELATIONAL...