ADS -- The NASA Astrophysics Data System
CDS -- Centre de Donnees astronomiques de Strasbourg
SIMBAD -- SIMBAD Astronomical Database
DSS -- ESO Online Digital Sky Survey
MAST -- Multimission Archive at Space Telescope
IUEFA -- The IUE Final Archive
Copernicus -- Data Archive
Geneva Grids -- Stellar Evolution Models
Robert L. Kurucz -- Homepage
Places IfA -- Institute for Astronomy/Hawaii
USM -- Universitäts-Sternwarte München
IoA -- Institute of Astronomy/Cambridge
CfA -- Harvard-Smithsonian Center for Astrophysics/Cambridge, MA
ESO -- European Southern Observatory/Garching
MPA -- Max-Planck-Institut für Astrophysik/Garching
MPE -- Max-Planck-Institut für extraterrestrische Physik/Garching
LSW -- Landessternwarte Heidelberg-Königstuhl
MPIA -- Max-Planck-Institut für Astronomie/Heidelberg
IAC -- Instituto de Astrofisica de Canarias/La Laguna
Journals A&A -- Astronomy & Astrophysics
ApJ -- The Astrophysical Journal
AJ -- The Astronomical Journal
MNRAS -- Monthly Notices of the Royal Astronomical Society
PASP -- Publications of the Astronomical Society of the Pacific
PASJ -- Publications of the Astronomical Society of Japan
ARAA -- Annual Reviews Astronomy & Astrophysics
Computing UK RmaX -- The UK RmaX Network
DARC -- Dirac Atomic R-matrix Code
Charlotte Froese Fischer -- Homepage
AAExcite -- Electron Impact Cross Section Calculations Using The Average Approximation
Misc Weizmann Institute -- Atomic Physics on the Internet Links
EnvironmentalChemistry.com -- Periodic Table
IAEA -- International Atomic Energy Agency: Nuclear Data Section/Atomic and Molecular Data Unit