THE OBJECTIVE OF THIS PROPOSAL IS TO RECOVER IONOSPHERIC AND ATMOSPHERIC PROFILES ACQUIRED BY THE PIONEER VENUS ORBITER (PVO) RADIO OCCULTATION INVESTIGATION FROM NSSDC DATASET PSPA-00345 AND PUBLISHED ARTICLES CLEAN THEM DOCUMENT THEM AND PACKAGE THEM FOR ARCHIVING AT THE PDS. - METHODOLOGY IN PRELIMINARY WORK WE ACQUIRED BINARY FILES FROM THE NSSDC CONTAINING THE PIONEER VENUS ORBITER RADIO OCCULTATION IONOSPHERIC AND NEUTRAL ATMOSPHERIC PROFILES. WE HAVE VERIFIED THAT THE CONTENTS OF THESE NSSDC FILES INCLUDE 94 ELECTRON DENSITY PROFILES AND 19 NEUTRAL ATMOSPHERIC PROFILES. THERE ARE FEWER NEUTRAL PROFILES BECAUSE THEY REQUIRED MUCH MORE INTENSIVE DATA PROCESSING THAN DID THE IONOSPHERIC PROFILES. THE RECOVERED PROFILES LOOK CORRECT AFTER AN INITIAL INSPECTION. THE DATA FILES ARE INCONSISTENTLY FORMATTED AND OFTEN OMIT ANCILLARY INFORMATION BUT THE CRITICAL PROFILES CAN BE IDENTIFIED. TO MAKE THE ARCHIVED DATASET MORE COMPLETE WE SHALL ALSO EXTRACT 100 ELECTRON DENSITY PROFILES AND 23 NEUTRAL ATMOSPHERIC PROFILES FROM FIGURES IN PUBLISHED ARTICLES. WE HAVE DEMONSTRATED THAT PROFILES EXTRACTED IN THIS MANNER ARE ACCURATE. WE PROPOSE TO PERFORM SANITY CHECKS ON ALL THESE PROFILES; TO USE SPICE TO DETERMINE ANCILLARY INFORMATION SUCH AS LATITUDE OR SOLAR ZENITH ANGLE WHERE IT IS MISSING; TO PACKAGE THE WHOLE DATASET FOR ARCHIVING AT THE PDS; AND TO RESOLVE LIENS IDENTIFIED BY THE PDS. - RELEVANCE OF PROPOSED RESEARCH TO THIS CALL FOR PROPOSALS THE VERTICAL PROFILES OF IONOSPHERIC ELECTRON DENSITY AND NEUTRAL DENSITY PRESSURE AND TEMPERATURE THAT WERE ACQUIRED BY RADIO OCCULTATIONS CONDUCTED BY THE PIONEER VENUS ORBITER (PVO) ARE SOME OF THE MOST USEFUL DATASETS EVER ACQUIRED FOR INVESTIGATIONS OF THE PLANET'S IONOSPHERE AND NEUTRAL ATMOSPHERE. THESE DATA PRODUCTS HAVE VERY SMALL MEASUREMENT ERRORS AND EXCELLENT VERTICAL RESOLUTION BY COMPARISON TO OTHER PVO IONOSPHERIC AND ATMOSPHERIC DATASETS. THESE DATA PRODUCTS WERE CRITICAL INPUTS INTO THE DEVELOPMENT OF THE VENUS INTERNATIONAL REFERENCE IONOSPHERE AND VENUS INTERNATIONAL REFERENCE ATMOSPHERE BUT ARE NOT WIDELY AVAILABLE. DESPITE THEIR IMPORTANCE FOR IONOSPHERIC STUDIES FRUSTRATINGLY FEW RADIO OCCULTATION ELECTRON DENSITY PROFILES FROM ANY PLANET ARE READILY AVAILABLE AND THIS HAS NEGATIVELY IMPACTED RESEARCH IN THIS AREA. FOR INSTANCE THE ONLY RADIO OCCULTATION ELECTRON DENSITY PROFILES AVAILABLE ON THE PDS FOR VENUS ARE APPROXIMATELY 30 VENERA 15/16 PROFILES WHOSE ARCHIVING WE COORDINATED SEVERAL YEARS AGO. THIS PROPOSED EFFORT IS ALIGNED WITH SECTION 1.3 "DATA SET RESTORATION AND ARCHIVING" OF THE PDART CALL FOR PROPOSALS.