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NASA: Nasa Technical Reports Server (NTRS). NTRS is an experimental service that allows users to search the many different abstract and technical report servers maintained by various NASA centers and programs. Specifically, it is a unified interface to many separate WAIS servers. NTRS is open to all members of the Internet/World Wide Web community.

US Department of Commerce / National Oceanic & Atmospheric Administration National Geophysical Data Center (NGDC). The NGDC manages environmental data in the fields of marine geology and geophysics, paleoclimatology, solar-terrestrial physics, solid earth geophysics, and glaciology. The Geophysical Data from the Solid Earth maintain extensive files of global environmental observations.

NASA
NASA (National Aeronautics and Space Administration): Guide to NASA Online Resources - Scientific Resources. The organizations or projects listed and annotated here are scientific endeavors either sponsored by NASA, affiliated with NASA, or of interest to the NASA scientific community.
See also Keyword Access or the Alphabetical List of Resources to the Guide to NASA online resources or its search engine, and the Resource Guide Home Page.

NASA SPACELINK. An aeronautics and space resource for educators. The library collection of over 13,000 files is the heart of NASA Spacelink. You will also find hundreds of subject-related links to other NASA sites on the Internet. With search engine.

NASA (National Aeronautics and Space Administration): EARTH OBSERVING SYSTEM GLOSSARY.

NASA (National Aeronautics and Space Administration): NASA Thesaurus.

NASA´s Mission to Planet Earth. Dedicated to understanding the many ways the Earth is constantly changing and how human beings influence those changes. The Scientific Data list gives information about the relevant projects.

NASA (National Aeronautics and Space Administration): THE GLOBAL CHANGE MASTER DIRECTORY (GCMD). This site is a comprehensive source of information about earth science. With search engine.

NASA (National Aeronautics and Space Administration): NASA Astrophysics Data System. At present the main emphasis is on the abstract service, which includes access to almost 1 million abstracts which can be searched by author, object name, keyword, title, or abstract text words.

NASA (National Aeronautics and Space Administration): International Solar-Terrestrial Physics Information Center (ISTP). The network information center for the International Solar-Terrestrial Physics Project, with database and ftp archive.

C. Wang et al. (2021): The Deep-Time Digital Earth program: data-driven discovery in geosciences. In PDF, National Science Review, 8: nwab027.
See also here.