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2. "Charged P a r t i c l e Measurements on a 30-CM Diamecer Mercury Ion Engine T h r u s t Beam", S. M. Sellen. J r . , G. K. KDmatsu, D. K. Hoffmaster, and R. F. Kemp, T8.W 25781-6001-RU-00,
3. April 1974.