THIS DOCUMENT UPDATES A PREVIOUS REPORT, "REFERENCE SOURCE ON SOVIET R & D STATISTICS, 1950-1978," REVISING AND FILLING IN SOME 1977 AND 1978 FIGURES AND EXTENDING ALL SERIES THROUGH 1980. IT CONTINUES THE METHODOLOGY FOR ADJUSTING SOVIET SCIENTIFIC MANPOWER DATA TO THE NSF CONCEPT OF SCIENTISTS AND ENGINEERS EMPLOYED IN R AND D, USED IN THE EARLIER REPORT AND ADDS TO THE EXPLANATION OF THE RATIONALE FOR THAT METHODOLOGY.