Sub-Micron Extraterrestrial Particles Collected at Balloon Altitudes: Quality and Preliminary Characterization Testa, J. ; Arnold, J. ; Stephens, J. ; Onaka, T. ; Nakada, Y. ; Cahill, T. ; Berg, W. Abstract Publication: Meteoritics Pub Date: December 1987 Bibcode: 1987Metic..22..514T