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    20/20 space communications.

    Hamilton, M. / Hunting, R. A. | NTRS | 1968

    20/30 GHz satellite personal communications networks

    Palmer, L. C. / Stern, A. / Sohn, P. Y. | NTRS | 1992

    20k h-0 screech work at lewis

    Bloomer, H. E. | NTRS | 1965

    20V, 40 Ah Lithium Ion Polymer Battery for the Spacesuit

    Darcy, Eric / Wilburn, Monique / Hall, Dan et al. | NTRS | 2006

    20 Years of Precision Orbit Determination for Altimetry with GPS

    Bertiger, Willy / Desai, Shailen / Dorsey, Angie et al. | NTRS | 2013

    21 cm intensity mapping; a progress report

    White, Steve / Srikanth, Sri / Ford, John et al. | NTRS | 2017

    21st Century Lunar Exploration: Advanced Radiation Exposure Assessment

    Anderson, Brooke / Clowdsley, Martha / Wilson, John et al. | NTRS | 2006

    21st Century Space Launch Complex

    Vu, Bruce | NTRS | 2011

    22 N HPGP Thruster Life Testing

    Henry W Mulkey / Wilhelm Dingertz | NTRS

    24 hour history of radar angel activity at three wavelengths.

    Glover, K. M. / Hardy, K. R. | NTRS | 1966

    25-ft. space simulator facility description

    Brown, R. / Fisher, T. C. | NTRS | 2001

    25-LBF GO2/GH2 space station thruster

    Finden, L. E. / Briley, G. L. / Iacabucci, R. S. | NTRS | 1988

    26th JANNAF Airbreathing Propulsion Subcommittee Meeting

    Fry, Ronald S. / Gannaway, Mary T. | NTRS | 2002

    26 x 6.6 radial-belted aircraft tire performance

    Davis, Pamela A. / Martinson, Veloria J. / Yager, Thomas J. et al. | NTRS | 1991

    27th JANNAF Combustion Subcommittee Meeting

    Gannaway, Mary T. | NTRS | 1990

    28-Bit serial word simulator/monitor

    Durbin, J. W. | NTRS | 1979

    28-Channel rotary transformer

    Mclyman, W. T. | NTRS | 1981

    30 cm Engineering Model thruster design and qualification tests

    Schnelker, D. E. / Collett, C. R. | NTRS | 1975

    30 degree injectors at hypervelocity conditions

    Loomis, Mark P. / Zambrana, Horacio A. / Bogdanoff, David W. et al. | NTRS | 1992

    30th Aerospace Mechanisms Symposium

    Bradley, Obie H., Jr. / Rogers, John F. | NTRS | 1996

    30 x 60 foot wind tunnel test highlights for an over-the-tail advanced turboprop configuration

    Coe, Paul L., Jr. / Perkins, John N. / Rhodes, Graham S. | NTRS | 1991

    30 Years of Atmospheric Radiometer Instruments and Technology Development

    Paul E Racette / Dongliang Wu / Thomas K Johnson et al. | NTRS

    31st JANNAF Combustion Subcommittee Meeting

    Gannaway, Mary T. | NTRS | 1994

    31st JANNAF Combustion Subcommittee Meeting

    Gannaway, Mary T. | NTRS | 1994

    32-Bit-Wide Memory Tolerates Failures

    Buskirk, Glenn A. | NTRS | 1990

    32 GHz deep space communications

    Hansen, D. M. / Horttor, R. L. / Riley, A. L. | NTRS | 1987

    32-GHz Wideband Maser Amplifier

    Shell, J. S. / Neff, D. E. | NTRS | 1990

    32nd Aerospace Mechanisms Symposium

    S. W. Walker / E. A. Boesiger | NTRS | 1998

    33rd Aerospace Mechanisms Symposium

    Edward A Boesiger / Edward C Litty / Donald R Sevilla | NTRS | 1999