U-Band Spiral Structure in M31

U-Geminorum 1970-79

U-Ophiuchi - the Third Body in the System

U-shaped multiband type II radio burst from a behind-limb solar flare

U-shaped type II solar radio bursts associated with the 1980 March 28 flare

U. B. V. Photometry of NGC 6405

U. C. T. Report (Applied Maths.)

U. Cephei (entdeckt von Ceraski, Juni 1880, A. N. 2324)

U. Geminorum, Baxendell's observations of, edited

U. K. 48-inch Schmidt Telescope Project

U. S. Lyons and observations of comets

U. S. N. Observatory Washington. Observations of Asteroids, made with the Filar-Micrometer by J. Ferguson

U. S. Naval Observatory Eclipse Expedition

U. S. Naval Observatory southern hemisphere expedition

U. S. Naval Observatory, Washington, DC 20392-5420. Report for the period Jul 1995 - Jun 1996.

U. S. Naval Observatory, Washington, DC 20392-5420. Report for the period Jul 1998 - Jun 1999.

U. S. Naval Research Laboratory Report

U. S. Participation in International Space Astrophysics Missions

U. V. Optical Complex Index of Refraction of Interstellar Medium Candidates: Enstatie, Troilite and Bronzite.

U. V. photographic results of the french experiment S 183 on Skylab