21-cm Observations with the NASA ADAS 18-meter Antenna System: Baseline Astronomical Observations and Measurements of Performance Characteristics
21-cm synthesis observations of VIRGOHI 21 - a possible dark galaxy in the Virgo Cluster
21-cm Tomography of the Intergalactic Medium at High Redshift
21-MICRON Observations of H II Regions
2112 new 21-cm line measurements (Theureau+ 1998)
215 GHz VLBI observations of bright Active Galactic Nuclei.
215 GHz VLBI observations: Detection of fringes on the 1147 KM baseline Pico Veleta-Plateau de Bure
21cm Absorption by Compact Hydrogen Disks Around Black Holes in Radio-Loud Nuclei of Galaxies
21cm line observations in the region 348° <= ell <= 360°, -22° <= B <= -1°
21cm observations of galaxies in the NW region of the Pisces-Perseus-Supercluster near the Galactic Plane
21cmFAST: A Fast, Semi-Numerical Simulation of the High-Redshift 21-cm Signal
21cmFAST: A Fast, Semi-Numerical Simulation of the High-Redshift 21-cm Signal
21st Century VLBI: Deep Wide-Field Surveys
22 year solar modulation of Earth's northern hemisphere temperatures
22-year Periodicity in the Solar Differential Rotation
220 GHZ Zenith Atmospheric Transparency at Iao, Hanle
221 Eos: a remnant of a partially differentiated parent body?
222Rn daughters influence on scaler mode of the ARGO-YBJ detector
223 GHz VLBI observations of 3C 273
22MHz flux densities of radio sources (Roger+, 1986)