4 Arc-Second Resolution of CO (2-1) Emission from the Circumstellar Shell of χ Cygni
4 Bursts from AXP 4U 0142+61
4 Color and Hβ Photometry of the Brightest Stars in the Magellanic Clouds.
4 Draconis - A unique triple system containing an M3 giant and a cataclysmic binary
4 major flares in small active regions in 1991.
4 Micron Continua of the Equatorial and Polar Regions of Jupiter
4 Supernova Discoveries
4 Supernova Discoveries
4 Supernova Discoveries
4 Supernova Discoveries
4 Supernova Discoveries
4 Supernova Discoveries
4 Vesta in der Opposition 1938
4-1 - 30 E methonal emission in G1.6-0.025
4-8 micron spectrophotometry of OH 0739-14
4-8 μ Observations of M82.
4-8 μ Observations of NGC 7027.
4-8μ Spectrophotometric Observations of NGC 7027 and M82
4-8μm Spectroscopy of NGC 7027
4-D homogeneous isotropic cosmological models generated by the 5-D vacuum