21-CENTIMETER Observations Near Galactic Longitude 120°.
21-cm absorbers at intermediate redshifts
21-CM Absorption Effects in the Spectra of Two Strong Radio Sources.
21-cm Background Anisotropies Can Discern Primordial Non-Gaussianity
21-cm cosmology
21-cm H I emission from the Damped Lyman-alpha absorber SBS 1543+593
21-cm Hydrogen Line Studies
21-CM Hydrogen Measurements of NGC 5668, a Relatively Distant Galaxy.
21-cm Line Absorption Profiles of Four Pulsars
21-cm Line Absorption Profiles of Pulsars PSR 0740-28 and PSR 1818-04
21-CM Line Emission from the Coma Cluster.
21-CM Line Observations of Galactic H II Regions
21-CM Line Profiles of 40 SA Spiral Galaxies
21-cm line radial velocities of galaxies.
21-cm Line Study of the Heavily Obscured Galaxy IC 10
21-cm line study of the peculiar galaxy NGC 5253.
21-cm neutral hydrogen line and continuum study of the galaxy Maffei 2.
21-cm neutral hydrogen line observations of compact galaxies.
21-cm neutral hydrogen line study of early type galaxies.
21-cm Observations at Low Latitudes in the Direction of the Galactic Centre