Olle, William "UL/1: a non-procedural language for retrieving information from data bases"

Morrell, A. (1968) Morrell, A. J. H. (Ed.): Information Processing 68, Proceedings of IFIP Congress 1968, Edinburgh, UK, 5-10 August 1968  

Languages mentioned BBN data management system {1965} GIS {1966} General Information Store INFOL {1964} Querying language MANAGE {1966} UL/1 {1965} Early non-procedural query language