Approximately 2000 technical reports on the microwave, radar and Loran navigation research and development program of Division 14 of the National Defense Research Committee are indexed in this bibliography. Section 1 contains a numerical list of reports which have bean assigned Division 14 report numbers. Section 2 ie a numerical index of regular reports, manuals, special reports and texts issued by MIT-RL under OSRD contract OEMsr-262. Section 3 la a combined index by subject matter of both Division 14 and MIT-RL reports. Section 4 lists Division 14 reports by the organization responsible for their preparation. Section 5 is an index of MIT-RL reports by author.