THE FERMI MISSION HAS USED IT SPECTRAL AND SPATIAL RESOLUTION TO GREAT AFFECT TO STUDY THE SITES OF COSMIC RAY ACCELERATION IN GALACTIC SUPERNOVA REMNANTS (SNRS). THE RECENT LAT CATALOG IDENTIFIED 30 GEV SNRS. DISTINGUISHING BETWEEN HADRONIC AND LEPTONIC EMISSION PROCESSES IS DIFFICULT. AS A RESULT, MORE THAN HALF THE LAT SNR CATALOG REMAINS UNCLASSIFIED. WE PROPOSE VLA OBSERVATIONS OF THESE SOURCES TO SEARCH FOR OH MASER EMISSION AT 1720 MHZ. THE DETECTION OF SUCH MASERS IS UNAMBIGUOUS PROOF THAT THE SNR IS INTERACTING WITH A MOLECULAR CLOUD, AND HENCE A HADRONIC ORIGIN FOR THE GAMMA-RAY EMISSION. OH MASERS ALLOW MEASUREMENTS TO BE MADE OF THE GAS DENSITY, THE DISTANCE AND (IN SOME CASES) THE MAGNETIC FIELD OF THE SNR. ALL OF THESE ARE IMPORTANT QUANTITIES IN TESTING ACCELERATION MODELS.