40- to 50-GHz array receiver with tunerless SIS mixers

40-350 micron observations of galactic sources

40-70 day meridional propagation of global circulation anomalies

400 GeV Gamma Rays From AE Aquarll

400 Gev gamma rays from the X-ray pulsar 1E2259+586

400 Jahre Mathematik und Astronomie an der Universitat Wurzburg: Alma Julia Herbipolensis 1582-1982 (400 Years Mathematics and Astronomy at the Wurzburg University: Alma Julia Herbipolensis 1582-1982)

400 Mc/s partial eclipse observations on 30 June 1954

400 Novae in M87

400 year record of Δ14C in tree rings: the solar-activity cycle before, during and after Maunder Minimum and the longer cycles.

400 years of astrometry: from Tycho Brahe to Hipparcos

400 Years of Astronomical Discovery: The Accelerating Understanding of our Place in the Universe

400 Years of Astronomical Telescopes

400 years of large fluence solar proton events

400 Years of Telescopes. (Slovenian Title: Stiristo let teleskopov)

400 Years of the Telescope

400 years of Uranometria.

400 years on from Tycho and Kepler.

400-kW Harmonic Filter

4000 Globular Clusters in M87

4000 years of climate change in Northern Spain from speleothem records