International Earth Rotation and Reference Systems Service - IERS provides data, publications and general information on the Earth`s orientation, the International Celestial Reference Frame (ICRF) and the International Terrestrial Reference Frame (ITRF), as well as geophysical data and conventions. EOS-WEBSTER - Digital library of free, customized earth science data from the University of New Hampshire. Unidata Internet Data Distribution (IDD) - Community of over 130 universities building a system for disseminating near real-time earth observations via the Internet. The system is designed so that a university can request that certain data sets be delivered to their computers as soon as they are available from the observing system. Earth Rotation Portal - Scientists at several institutions are investigating aspects of the Earth's rotation in ten thematic projects with the aim of accounting for the unexplained variations. Geoscience Data Repository - A collection of earth science databases managed by Canadian Natural Resources, allows for viewing and download. NERC: Data Centres - Directory of Designated Data Centres from the Natural Environment Research Council in the United Kingdom. British Atmospheric Data Centre (BADC) - The Natural Environment Research Council (NERC) designated data centre for the Atmospheric Sciences in the United Kingdom.