Definitions for "Z39.50"
"American National Standard Z39.50: Information Retrieval Service Definition and Protocol Specification for Library Applications." This was designed to...
An ANSI/NISO developed protocol for information retrieval - also known as ISO 23950
ANSI/NISO standard for information retrieval service definition and protocol specification. It allows an application on one host to query and retrieve data from databases on another host
Keywords:  lcweb, loc, fifty, thirty, gov
"Z Thirty-Nine Dot Fifty" http://lcweb.loc.gov/z3950/agency