18 O / 16 O ratios in Luna 16 fines
18 O values, 87 Sr / 86 Sr and Sr/Mg ratios of Late Devonian abiotic marine calcite: Implications for the composition of ancient seawater
18 O/ 16 O and 2 H/ 1 H changes during progressive hydration of a Zechstein anhydrite formation
18 Years of Flight Experience with the UoSAT Microsatellites
18 years of science with the Hubble Space Telescope
18- to 20-nm broadband multilayer at normal incidence
18-cm Flux Measurements of BL Lacertae
18-cm observations of an outburst in V711 Tau
18-cm OH Absorption of W 49 A and W 48 B
18-cm OH lines in comets (Crovisier+, 2002)
18-cm Transitions in O17H and O18H-Laboratory and Astronomical Measurements
18-cm VLA observations of OH towards the Galactic Centre. Absorption and emission in the four ground-state OH lines
18-CM Wavelength Radio Monitoring of the OH Radical in Comet p/ Halley 1982I
18-MEGACYCLE Observations of Jupiter in 1957.
18-min. Light-Variations of HZ 29
18-months of UV irradiance observations from the Solar Mesosphere Explorer
18.1919 Orionis
18.1929 Sagittarii = BD - 20°5253
18.3 Mc/s Radiation from Jupiter
18.6-year lunar nodal tides from altimeter data