A Computer System for Inference Execution and Data Retrieval
This paper presents a RAND project concerned
with the use of computers as assistants in the 
logical analysis of large collections of factual data.
 A system called Relational Data File was developed 
for this purpose.  The Relational Data File is briefly
detailed and problems arising from its implementation 
are discussed.
CACM November, 1967
Levien, R. E.
