18 O / 16 O ratios in Luna 16 fines

18- to 20-nm broadband multilayer at normal incidence

18-cm Flux Measurements of BL Lacertae

18-cm OH lines in comets (Crovisier+, 2002)

18-min. Light-Variations of HZ 29

18-months of UV irradiance observations from the Solar Mesosphere Explorer

18.3 Mc/s Radiation from Jupiter

18.6-year lunar nodal tides from altimeter data

180 degree n-p cross sections for fast neutron measurements with counter telescopes

180 Garumna CCD Spectrum

180-425 GHz Low Noise SIS Waveguide Receivers Employing Tuned Nb/AlOx/Tunnel Junctions

180-500 GHz Low Noise SIS Waveguide Receivers Employing Tuned Nb/Al-Oxide/Nb Tunnel Junctions (abstract only)

1807 Slovakia CCD Spectrum

181 Eucharis CCD Spectrum

181325. Nova Sagittarii, No. 3. H.V. 3306

1817-18 Nova Sagittarii 1992 #2

1817-23 Nova Sagittarii 1992 No. 3

181eucharis

182 Elsa CCD Spectrum

1824-17 Nova Sagittarii 1994 Number 2